[1] Over the years the two divers, in addition to others, explored both the Keld Head and West Kingsdale Master Cave systems.
Hasenmayer became temporarily trapped in a narrow passage, and Yeadon attempted to help him escape it at great personal risk.
In July, the connection was officially made by Yeadon, Statham, and Hasenmayer traveling from Keld Head until they reached the Kingsdale line.
Their next goal would be to traverse the entire 1,829 m (6,001 ft) distance between Keld Head and the West Kingsdale Master Cave.
[3] Once the dive begins, they are able to maintain contact with the crew on the surface thanks to the use of a new radio technology dubbed the "Molefone"—a type of speleophone that enabled communication via magnetic induction.
[4][3] At Dead Man's Handshake, Statham encounters serious trouble when a piece of rock jams his demand valve, though he is able to clear the obstacle and maintain his air supply.
After clearing Dead Man's Handshake, the pair are in good spirits and Statham's singing of "Show Me the Way to Go Home" is picked up on the radios as they near completion of the dive.
Statham was equipped with two lightweight, waterproof cameras, while Yeadon was charged with maintaining radio contact with the surface via the speleophone.