J. Peress' 1-atm dive suit, Tritonia, explored the Lusitania wreck in 1935. Jim Jarrett was Peress's chief diver and made this dive to 312 feet. This suit was a precursor to the "Jim" suit, named for Jim Jarrett.

From NOAA Photo Library
Image ID: nur06017, National Undersearch Research Program (NURP) Collection
Credit: OAR/National Undersea Research Program (NURP)
Source: http://www.photolib.noaa.gov/nurp/nur06017.htm

In 1935, a diver wearing a 1 atmosphere diving suit (a suit which maintained an internal pressure of one atmosphere -- the same pressure as at the surface of the ocean.) developed by J. Peress, is about to explore the wreck of the Lusitania. Alternate source.

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