Since then improvements to techniques and equipment have led to deeper escapes being made from submarines. The current record stands at 600feet (180m) from a submarine. This was conducted to prove that escapes were possible down to the level of the continental shelf, where the majority of incidents would be likely to occur.
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Horsea Island Dive Centre first started using the SETT in 2000, with the initial idea of giving the less experienced diver a controlled dive to nearly 30m, or to practice deeper rescue skills in a swimming pool environment. Although to date the majority of divers come here for a unique experience, with 30m and water temperature of 34 degrees and top to bottom visibility, there are not many locations in the U.K. to match it.