Pisces IV is a three-person, battery-powered deep-submergence vehicle, with a maximum operating depth of 2,000 m (6,600 ft). The craft was built by Hyco International Hydrodynamics in Vancouver, and is currently owned by the Hawaii Undersea Research Laboratory arm of the National Oceanic and Atmospheric Administration. It and its sister, Pisces V, are Pisces class submersibles used by the NOAA for oceanic exploration.
Pisces IV being launched from its support vessel, the R/V Ka‘imikai-o-Kanaloah
Hawaii Undersea Research Laboratory
The Hawaiʻi Undersea Research Laboratory (HURL) is a regional undersea research program within the School of Ocean and Earth Science and Technology (SOEST) at University of Hawaiʻi at Mānoa, in Honolulu. It is considered one of the more important of the independently run undersea research laboratories in the U.S. HURL operated two deep diving submersibles, the Pisces IV and Pisces V and specializes in supporting scientific ocean research and exploration. HURL is actively involved in monitoring deep-sea ecosystems, including coral habitats and fisheries, and conducts maritime archaeology research including documenting World War II wreckage from the Attack on Pearl Harbor in 1941.
Hawaii Undersea Research Laboratory
Volcanic vent observatory on Lo'ihi seamount set up by HURL.
Manipulator arm on the Pisces V submersible collecting a glass sponge.
Underwater image of the Japanese mini sub involved in the attack on Pearl Harbor. It was first discovered by HURL sunk off the south shore of Oʻahu.
