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Captain Nemo could have used the Pelican Nemo 2010 LED Flashlight on the Nautilus. Submersible to 500 ft with LED Recoil Technology this light will light up any environment.Recoil LED Technology produces a white collimated beam that's as bright as an incandescent light and provides 10,000 hours of lamp life and extended battery burn time. The rugged, light weight ABS resin body is submersible to 500 feet.A twist on/off lens shroud eliminates accidental discharge. With 3 C Alkaline cells this light weighs 13.4 oz. and produces 109 Lumens.