Cave Records | Stump Cross Caverns

It's no secret that caves are among the world's natural wonders. Their otherworldly beauty and the unearthed treasures they hold have been a lure for inquisitive minds since way back in the Stone Age.

However, for some, exploring simply isn't enough. A handful of the most determined explorers and cavers have pushed their physical and mental abilities to the limit, expanding the boundaries of cave exploration and breaking records along the way.

Here are six of the most extraordinary cave-related world records.

1. Deepest cave dive

Fifty-year-old mechanical engineer Frédéric Swierczynski recently broke the world record for the deepest cave dive. On 3 November 2023, he reached an astonishing depth of 308 metres.

The record-breaking descent was achieved in the Font Estramar cave in Salses, near the southern coast of France.

Swierczynski set out on his first cave dive at the young age of 12 and has spent many years exploring and developing his knowledge of flooded caves.

The acclaimed diver describes Font Estramar as "a complex labyrinth of corridors and dead ends, where losing your way is not an option". He spent many hours familiarising himself with the topography of the cave system in preparation for the venture.

Upon completing his seven-hour expedition, Swierczynski noted the beauty of the cave. He observed that during the descent, "the rock formations become lighter, indicating a shift in geological layers – as if travelling back in time".

2. Most prolific cave explorer

American-born Marion Smith holds the record for the most caves explored after traversing 8,291 separate cave systems in his lifetime.

After entering his first cave in 1966, the natural-born explorer was hooked and spent almost all of his free time traversing up and down these underground mazes.

Smith was particularly keen on vertical caving and is thought to have scaled more than two million feet of rope.

No doubt about it: he was hooked on the exploration and mapping of cave systems – both familiar and new. And in 2013, he set a personal record of 335 cave visits in one year (which is even more impressive when you consider that he was 71 years old at the time).

Some years before this, Smith was part of a team that was exploring caves in East Tennessee. On one expedition, the team discovered an incredible 4.5-acre, 350-foot-tall subterranean chamber. They collectively decided to keep this new discovery secret and spent the next four years meticulously mapping the area.

3. Tallest stalagmite

4. Largest single cave passage

The Hang Sơn Đoòng cave in Vietnam is not only hailed as the world's biggest natural cave – at an unimaginably huge 38.5 million cubic metres – but it's also home to the world's tallest stalagmite. This rock giant stands at some 80 metres tall – only a few metres shy of the Statue of Liberty.

Hang Sơn Đoòng (meaning Mountain River Cave) is an incredible example of the beauty and power of Mother Nature. Although only formally surveyed in 2009, the immense proportions of the cave draw in a huge number of visitors each year.

As well as the record-breaking stalagmite, the cave features many natural treasures. These include fossilised corals from hundreds of millions of years ago, as well as cave pearls: deposits of calcium carbonate from the cave's roof. Some are as small as peas, while others are as large as footballs.

A visit to the world's largest natural cave will undoubtedly be unforgettable – but make sure to go prepared. Many hours of laborious hiking and navigating the cave's underground lakes will require tremendous skill and effort, as well as proper equipment.

5. Oldest known palaeolithic cave art

Caves are wonderful places to explore and marvel at the beauty of nature. But they're not just fascinating for explorers – they're of great importance to historians, too.

Artefacts and evidence collected from caves around the world have helped archaeologists piece together images of the past that would otherwise have been lost to time.

If you head to the Cantabrian Coast in Spain, you'll find the Cueva de El Castillo or Cave of the Castle. Inside are what we now believe to be the world's oldest cave paintings.

After incredibly rigorous testing, one painting (namely a large, reddish disk) was found to be more than 40,000 years old.

While the discovery of these ancient paintings alone is awe-inspiring, some experts claim that their record-breaking age means they were actually created by Neanderthals. If true, this gives rise to new questions about the history of our species.

6. Longest time spent in a cave

Beatriz Flamini, a 50-year-old mountaineer, claimed a new world record in 2023 after spending a whopping 500 days underground.

Closely monitored by a team of scientists, psychologists and speleologists, Flamini spent the duration some 230 feet down in a cave just outside of Granada in Spain.

Following a strict "no contact" rule, Flamini's time underground was used to further studies on social isolation and the body's circadian rhythms.

Flamini apparently enjoyed the peace and quiet of the experiment. So much so, in fact, that when her support team entered the cave after 500 days, she "didn't want to come out" !

We applaud Flamini's passion and enthusiasm for the experiment as this is a record that's particularly close to our hearts. That's because a previous record holder actually carried out his underground stint at our very own Stump Cross Caverns.

Caving expert Geoff Workman broke this very same record back in 1963 after an amazing 105 days spent underground in the beautiful Yorkshire Dales.