Pisces IV Submersible

The Pisces IV is a three-person, battery-powered, submersible with an operating depth range of 2000 m. Along with its sister submersible, the Pisces V, the Pisces IV weighs 13 tons and has a payload of 200 pounds. The personnel sphere of each sub is 7 feet in diameter and is made of HY 100 steel.

Related Link

http://www.soest.hawaii.edu/HURL/subops/piscesIV.html