 The intention of the suit is to keep the escapee dry and protected from cold shock during ascent, and to provide buoyancy, freeboard, and thermal insulation at the surface.Following a nearly 30-year hiatus, the U.S. Navy reinstituted pressurized submarine escape training (PSET) for submarine sailors in 2009, using the Beaufort Mk 10 Submarine Escape and Immersion Equipment (SEIE) suit.In a "Undersea & Hyperbaric Medicine" review of training, O'Donnell and Horn report that "During the first 39 months of training, 7,025 students screened for PSET with 32% completing all phases, including two pressurized ascents.