NOAA hydrophones recorded the 1997 “Bloop,” a sound so loud it travelled over 3,219 kilometres underwater.

People continue to argue about a single sound from the deep ocean, nearly 30 years after its first recording. The “Bloop,”, a strange, powerful underwater noise picked up in 1997, has been folded into YouTube conspiracies.

Lovecraft memes and endless comments insist on the existence of Megalodon. The science says otherwise. But the route from mystery to explanation is precisely why this sound has stayed lodged in people’s heads for so long.

The shark that everyone wanted it to be was megalodon.

Given its status as one of the largest predators in history, the megalodon was inevitably the primary suspect in any “monster noise” story. The earliest fossils of Otodus megalodon (formerly known as Carcharodon or Carcharocles megalodon) date back around 23 million years.

For close to 20 million years, the shark ruled global oceans, disappearing only about 3.6 million years ago. A 2025 study written by 29 fossil shark experts estimated that megalodon may have grown up to 24.3 metres long.

That would make it roughly four times longer than the biggest recorded great white shark and even longer than today’s largest whale shark, which comes in at about 18.8 metres.

A 6-inch megalodon tooth (left) dwarfs a 2-inch great white tooth (right), each inch marking roughly 10 feet of shark / Photo by iStock.com

Given the cultural context of such a large animal, it didn’t take much for people to hear an unexplained underwater sound and immediately conclude it was a “giant prehistoric shark”.

The sound travelled across the Pacific Ocean.

The Bloop was first detected in the summer of 1997 by hydrophones operated by the US National Oceanic and Atmospheric Administration (NOAA) in the southern Pacific Ocean. While searching for underwater volcanic activity, researchers detected something quite distinct.

Using hydrophones, underwater microphones, spaced more than 3,219 kilometres apart across the Pacific, they recorded multiple instances of the same noise. It was extremely loud and had a distinct rising pattern.

They had never heard the sound before, and the signal’s strength allowed them to track it across a vast distance. It quickly picked up a nickname: the Bloop. According to Discovery UK, several scientists noted that the sound resembled an amplified whale call, which led some to suggest it might have been produced by a living creature.

The problem was scale: it was significantly louder than any known animal. Others suggested more mundane geophysical explanations, such as underwater volcanic activity or tectonic plate movement, both of which are known to create unsettling low-frequency sounds.

In the absence of a confirmed source, speculation filled the gap. As Mirror US reported, online theories ranged from an undiscovered ocean giant to H. P. Lovecraft’s fictional Cthulhu.

Megalodon was the obvious real-world candidate: huge, already famous and conveniently extinct. For years, the sound sat in that uneasy space between data and guesswork.

What NOAA eventually found in Antarctica

The answer didn’t arrive quickly. Throughout the early 2000s, NOAA’s Pacific Marine Environmental Laboratory kept deploying hydrophones closer to Antarctica as part of a long-term effort to study the sounds of seafloor volcanoes and earthquakes.

Only in 2005, after years of collecting more recordings closer to the Antarctic, did scientists finally pinpoint the origin of the Bloop. NOAA later explained, “As the years passed, PMEL researchers continued to deploy hydrophones ever closer to Antarctica in an ongoing effort to study the sounds of seafloor volcanoes and earthquakes.

It was there, on Earth’s lonely southernmost landmass, that they finally discovered the source of those thunderous rumbles from the deep in 2005. The Bloop was the sound of an icequake, an iceberg cracking and breaking away from an Antarctic glacier! With global warming, more and more icequakes occur annually, breaking off glaciers, cracking them, and eventually melting into the ocean.

“So the Bloop turned out not to be a call from a colossal animal but the sound of ice under stress: an iceberg fracturing and tearing away from a glacier. The mystery didn’t reveal a hidden predator. It revealed a planet warming fast enough to make the ice itself noisy.

Scientists do not believe in the existence of a living megalodon.

Even without the icequake explanation, researchers have had a consistent view of the “megalodon is still alive” theory: it doesn’t fit what we know about sharks, food webs or the fossil record. Big predatory sharks, including great whites, shed large numbers of teeth throughout their lives, and those teeth wash up on beaches around the world.

An animal up to 24 metres long, eating massive marine mammals, would leave fresh evidence behind, not just ancient fossils. If a shark that size were still roaming the oceans, we would expect to discover recent teeth, not just ones that are millions of years old.

Additionally, there is the question of what such a creature would eat. The darkest, deepest parts of the ocean are relatively poor in prey. A shark as large as megalodon would be drawn to places where big animals are concentrated, such as whale migration routes or seal colonies, many of which are closer to coasts.

That kind of activity would be difficult to miss, especially in a world of satellite tracking, commercial shipping and industrial fishing. Put simply: for megalodon to be alive today, it would have to be both enormous and strangely invisible. That combination is extremely unlikely.

People were disappointed by the truth for several reasons.

When NOAA confirmed that the Bloop was an icequake, not a living creature, some people felt let down. On Reddit, one user admitted as much: “No kidding. I was excited for scientists discovering a new, previously unknown life form in the deep ocean.

I know there’s a tonne of species down there we haven’t discovered, but they’re probably all going to be tiny or not much bigger than a small dog. I want science to discover something HUGE.” Another commenter was more sceptical than disappointed.

asking why it had taken so long to settle on ice as the answer: “Weren’t there a number of experts saying that it was almost certainly organic in nature? Could you provide an explanation for why this instance of iceberg cracking was particularly loud? Could you please explain why it took NOAA an extended period to attribute it to icebergs cracking?

I’m not suggesting it’s Cthulhu or anything (just desperately hoping); I’m just curious about why it took so long. Part of that delay is practical: the ocean is vast, hydrophones don’t cover every corner, and it takes time to collect enough comparative recordings to say, with confidence, that two sounds have the same source. Another part is cultural: dramatic theories spread faster than slow, methodical explanations.

What the Bloop ultimately left us with is a clearer understanding of its origins.

By 2025, the Bloop is no longer a fresh mystery. The recording is old, the explanation is published, and megalodon remains comfortably extinct. But the story still matters, partly because of what it reveals about us. Faced with an unexplained sound from the deep ocean, people reached for creatures, not climate.

The real answer, an iceberg cracking away from a glacier in a warming world, is less cinematic but far more pressing. The ocean is still full of mysteries. There are certainly species we haven’t found yet. But if the Bloop taught us anything, it’s that the most unsettling noises from the deep may not be from monsters at all but from the planet itself shifting under the strain we’ve put on it.

More than 60,000 African penguins vanished from two of South Africa’s most important breeding islands in less than a decade, and scientists say they now understand why.

A study published in the journal Ostrich: Journal of African Ornithology has revealed that the collapse of sardine stocks triggered an unprecedented wave of starvation, wiping out more than 95 percent of the colonies on Dassen Island and Robben Island between 2004 and 2012.

The discovery highlights a crisis unfolding across the entire species. African penguins have declined by nearly 80 per cent globally in the past thirty years, and the dramatic losses on these islands show how dangerously close they are to disappearing altogether.

Penguins died due to the collapse in food supply

The research, conducted by the University of Exeter and South Africa’s Department of Forestry, Fisheries and Environment, found that the birds died primarily because their main prey fish virtually disappeared.

Sardine biomass fell to less than 25 per cent of its historical maximum for years, creating conditions that made it impossible for many penguins to survive. Around 62,000 birds are thought to have died between 2004 and 2011, a period when sardine stocks remained critically low.

The study contends that these shortages were caused by changes in the environment of the area, such as warmer and saltier waters that made it harder for sardines to reproduce, along with constant fishing pressure that continued even as sardine numbers fell.

Starvation during the moult proved fatal

One of the most striking findings concerns the penguins’ annual moult. During this process, African penguins shed and regrow their feathers, which means they cannot enter the water to hunt for about twenty-one days.

They rely entirely on stored fat and muscle to survive this fasting period. Lead researcher Dr. Richard Sherley explained that if penguins are unable to find enough food before the moult, or immediately afterwards,

They simply do not have the reserves needed to stay alive. With sardines in short supply, thousands of birds entered the moult already weakened, and many never recovered.

Colonies that once thrived now nearly empty

Dassen Island and Robben Island were once strongholds for African penguins, hosting tens of thousands of breeding birds. By 2012, more than 95 percent of these populations had disappeared.

The islands now serve as powerful illustrations of how quickly a species can collapse when its food chain fails.

The losses formed a major part of the evidence that led to African penguins being classified as critically endangered in 2024, with fewer than 10,000 breeding pairs remaining worldwide.

Fisheries mismanagement is under scrutiny.

Marine conservation experts say the crisis also reflects long-term failures in managing sardine fisheries. The study found that commercial fishing continued even when sardine numbers fell below safe biological thresholds.

Removing prey fish at such low levels meant penguins had little chance of recovering their strength after the moult or feeding chicks successfully. Some scientists argue that the penguin die-off was not an isolated event but part of a wider pattern affecting several sardine-dependent species in South African waters. Recently,

South Africa has introduced fishing bans around the six largest penguin breeding colonies to reduce competition for sardines. Other interventions include providing artificial nests, controlling predators and rehabilitating undernourished chicks.

There are early signs of stability in a few colonies, although researchers warn that recovery remains uncertain. Sardine stocks must rebuild to sustainable levels before penguins can begin to recover their population strength.

A species on the edge

The study concludes that future success depends on strict limits to sardine fishing whenever stocks fall below 25 percent of their maximum abundance. Allowing sardine numbers to rebuild would give penguins a chance to survive the moult and raise chicks more successfully. For now,

The mass die-off on Dassen and Robben Islands remains one of the most severe wildlife losses in modern South African history. It also stands as a warning that without urgent action, one of Africa’s most iconic seabirds could disappear within a generation.

The launch of Sentinel-6B, a new environmental monitoring satellite developed as part of a multibillion-dollar worldwide programme, marks a significant advancement in climate monitoring.

NASA has made a major advancement in its long-term climate monitoring mission. Launched in mid-November atop a SpaceX rocket, the satellite is expected to provide highly precise data on sea-level rise and atmospheric conditions, letting scientists follow the growing impacts of climate change.

Measuring 19.1 feet long and weighing around 2,600 pounds when fuelled, Sentinel-6B has powerful sensors capable of capturing minute changes across Earth’s oceans and atmosphere. Currently in orbit, Sentinel-6B flies about 30 seconds behind its twin, the Sentinel-6 Michael Freilich satellite.

When scientists and engineers have completed cross-calibrating the data collected by the two spacecraft, Sentinel-6B will take over the role of providing primary sea level measurements, while Sentinel-6 Michael Freilich will move into a different orbit.

Sentinel-6B: NASA’s new satellite advances sea-level and climate change research.

As per NASA, the Jason Continuity of Service mission on the Sentinel-6 spacecraft is an international partnership between the U.S. and Europe. Jason-CS/Sentinel-6 includes two identical satellites, with the first launched November 21, 2020 (Sentinel-6) and the second launched November 16, 2025 (satellite B).

These satellites will continue to detect global sea level rise, one of the most significant markers of climate change brought on by human activity, just like their predecessors. Data collected supports city planners, as well as municipal and state governments, to make informed decisions on protecting coastal infrastructure and other coastal assets.

Both satellites measure sea levels, wind speeds, and wave heights, which meteorologists feed into models that provide marine weather forecasts. The data will also enhance operational oceanography through improved forecasts of ocean currents as well as wind and wave conditions.

The sea level observations also provide information on big currents that can aid in commercial and naval navigation, search and rescue, and the tracking of debris and pollution from disasters at sea.

Key Instruments on Sentinel-6B: How NASA’s Satellite Measures Sea Levels and Atmospheric Change

NASA shows the new satellite carries several instruments to support science goals that can determine the ocean’s surface height to within a centimetre. The satellite tracks rising sea levels, which are one of the most prominent indicators of climate change.

Other onboard instruments will be used to precisely determine the satellite’s position (DORIS, Laser Retroreflector Array), perform data downlinks (S-band and X-band antennas), and supply power (Solar Array). Sentinel-6 is a combined EU and US mission.

merging the expertise of EUMETSAT, ESA, NASA, NOAA, and CNES to generate precise global sea level records. Before becoming fully operational, Sentinel-6B will undergo several months of calibration in orbit. After Sentinel 4A, Sentinel 5A, and Sentinel 1D, this launch marks the fourth successful Copernicus Sentinel mission of 2025.

Doctors warn microsleep is the sleep they fear most, a 1–30 second blackout where your brain stops processing anything, often with your eyes still open.

People often imagine danger creeping in when they stay awake too long, with the nodding head, the heavy eyes, and the drift into sleep they try to fight off. What they don’t anticipate is a sudden onset of sleep, often occurring without their eyes even closing.

Doctors call it microsleep: a brief involuntary shutdown of the brain lasting from a single second to about 30. Most people don’t realise it until they jolt awake, reread the same sentence, or drift across a lane while driving.

Sometimes it’s even more bizarre; you blink, and in that moment, an entire dream, a scene, or a story arc unfolds, as if you’ve slipped into a parallel universe and returned in an instant.

What microsleep actually is?

Microsleep is generally defined as a short, uncontrolled episode in which the brain slips into sleep-like activity while a person is still nominally awake. Several sleep laboratories describe it as lasting roughly 1–30 seconds, causing a temporary loss of attention, memory lapses, and a dramatically slowed reaction time.

People often experience it as head-drooping, zoning out, sudden muscle jerks, or a momentary lapse in awareness. Researchers widely attribute the primary cause to severe sleep deprivation; the brain simply forces itself offline when it can no longer gradually maintain wakefulness.

Monotonous or repetitive tasks, such as long-distance driving, late-night television or nightshift monitoring, can subtly trigger them, especially when a person is already tired.

Circadian rhythms also play a role, making microsleep more likely during brief natural dips in alertness, such as late at night or in the early hours of the morning, when notably low energy levels can lead to unexpected lapses.

One of the clearest public explanations of microsleep has come from Dr Myro Figura, a board-certified anaesthesiologist, medical school educator and physician entrepreneur based in Los Angeles.

Dr Figura works as an attending physician and assistant clinical professor in the Department of Anaesthesiology and Perioperative Medicine at UCLA Health and has more than a decade of experience teaching medical students and mentoring residents. He is also the co-founder and Chief Marketing Officer of HealFast, a company that makes products for surgery recovery. In a widely circulated video,

Dr Figura calls microsleep “wild and scary”, explaining, “Microsleep is wild and scary because it is your brain involuntarily blacking out for a fraction of a second up to 30 seconds. Your eyes might stay open, but your brain is not processing anything. It’s a complete reboot that happens after you don’t sleep for about 24 hours.”

He notes that it’s estimated to be responsible for around 100,000 car crashes every year, adding that healthcare workers, including himself, are particularly vulnerable because they often work 24-hour on-call shifts.

Doctors compare it to being drunk because cognitive impairment after 24 hours without sleep can resemble intoxication.

In the same video, Dr Figura warns that after 24 hours without sleep, cognitive impairment can resemble intoxication: “And the really shocking fact is, in addition to microsleep, after 24 hours of sleep deprivation, you are as impaired as a drunk driver.

That’s right. Not sleeping for 24 hours is equivalent to having a blood alcohol level equivalent to driving drunk.” For anaesthesiologists and other emergency specialists, such a condition carries a very specific implication.

Imagine having to perform surgery in this state during an emergency in the middle of the night. That’s what healthcare workers have to do,” he adds.

How people try to prevent microsleep

A number of sleep clinics and road safety organisations publish guidelines aimed at reducing microsleep risks, particularly while driving. These include practical measures such as:

These recommendations do not eliminate microsleep, but they are widely circulated as risk-reduction strategies. Some clinics also issue broad sleep hygiene advice, such as behavioural recommendations intended to promote more consistent rest.

These may include aiming for 7–8 hours of nightly sleep, keeping a regular sleep–wake schedule, reducing caffeine after 4 p.m., and using warmer, low-intensity lighting in bedrooms.

Other common guidance includes bedroom temperature suggestions (often 25–26°C), avoiding screens late at night, and maintaining a consistent bedtime.

What happens when people ignore it

Doctors and road-safety agencies warn that microsleep often occurs precisely when someone believes they can “push through” their tiredness.

Several sleep specialists note that people routinely overestimate their ability to stay awake, especially during monotonous activities or long stretches of night driving. The risk isn’t the drowsiness itself;

It’s the momentary blackout that follows, during which the brain simply stops processing incoming information. Even a few seconds of lost awareness can be catastrophic at motorway speeds.

Many sleep centres describe circadian rhythm disruptions as another contributing factor. Going to sleep late and waking up late can disrupt hormonal patterns and reduce sleep quality.

Delayed Sleep Phase Syndrome, a disorder where a person’s internal clock runs much later than the external day–night cycle, can make consistent rest difficult and increase the likelihood of insufficient sleep.

A danger you don’t feel coming

Microsleep is unnerving precisely because it often announces itself with nothing more than a blink, or nothing at all.

The person experiencing it might not realise they’ve been “offline” until a sentence suddenly stops making sense or the car drifts toward a rumble strip. As Dr. Figura explains, the danger lies in the invisibility of microsleep: the brain is “not processing anything” while the body remains upright with eyes open.

performing a task it can no longer truly control. For most people, the safest protection is simply adequate sleep and the acknowledgement that the body has limits it can’t negotiate with.