Pisces-class deep submergence vehicle

History
United States
Name	Pisces IV and Pisces V
Owner	National Oceanic and Atmospheric Administration
Operator	Hawaii Undersea Research Laboratory
Builder	Hyco International Hydrodynamics, North Vancouver
Completed	Early 1970s
General characteristics
Displacement	13,000kg
Length	6.10 m (20 ft 0 in)
Beam	3.20 m (10 ft 6 in)
Height	3.35 m (11 ft 0 in)
Propulsion	2 × side-mounted reversible thrusters tiltable through 90 degree, 2 × lead-acid battery systems: 120 V DC at 330 Ah capacity and 12–24 V DC at 220 Ah capacity
Speed	2.0 knots
Range	7–10 hours operational time
Endurance	140 hours life support for 3 people
Test depth	2,000 m (6,600 ft)
Crew	3 persons
Sensors and processing systems	Tritech SeaKing digital high definition sonar, Laser scaling system, Falmouth Scientific Micro CTD, Simrad altimeter sonar, Seabird Electronics Seacat CTD (Conductivity, Temperature, Depth) seawater profiler, TrackLink 5000HA USBL submersible tracking system, Sonatech long baseline acoustic tracking system, externally-mounted thermistors-internal meters
Notes	600 lb payload. HYCO Hydrodynamics manipulator: Schilling Titan 7 degrees of freedom[1]

Pisces-class submersibles are three-person research deep-submergence vehicles designed and built by Hyco International Hydrodynamics of North Vancouver in British Columbia with a maximum operating depth of 2,000 m (6,560 ft). The vehicles have multiple view ports and sample collecting, environmental sensing, and instrument placement capabilities. The pressure hull has a 7 ft (2.1 m) inside diameter and is made of HY-100 steel with three forward-looking acrylic windows, 6 in (15 cm) in diameter. Designed by Allan Trice, the Pisces series of submersibles were representative of crewed submersibles built in the late 1960s and were proven workhorses in offshore exploration and oceanographic research. Pisces II was the first production model of the design and was completed in 1968, with nine more Pisces submarines built before the manufacturer went out of business in the late 1970s.