The Historic 1935 Expedition
In 1935, Wookey Hole became the site of Britain's first successful cave diving expedition when pioneering explorers Graham Balcombe and Penelope Powell ventured beyond the flooded passages that had stopped previous explorers in their tracks. Their groundbreaking dive opened the door to an entirely new chapter of underground exploration and helped establish Wookey Hole as one of the most important cave diving sites in the world.
Using heavy standard diving equipment, including brass helmets, air hoses and lead boots, the team navigated near-zero visibility beneath the surface. What they discovered would change cave exploration forever.
On those pioneering dives, Graham Balcombe and Penelope Powell successfully passed flooded sections of the cave and reached previously unseen chambers hidden deep beneath the Mendip Hills. Their work proved that underwater cave systems could be explored safely using breathing apparatus and laid the foundations for modern cave diving techniques.
The expedition reached Chamber 7, revealing a vast underground world that no human had ever seen before. At the time, it was one of the most significant cave exploration achievements in Britain.
Today, Penelope Powell is recognised as one of the pioneering figures of cave diving, while Graham Balcombe went on to become a founding figure of the Cave Diving Group, the world's oldest surviving cave diving organisation.