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Submersible Completes 1,000th Dive Off Hawaii
Divers Dave Pence (left) and Ken Longenecker (right) hold up a banner commemorating the Hawaii Undersea Research Laboratory's 1,000th dive with the Pisces submersibles.
Credit: R.L. Pyle.

Marine scientists recently celebrated the 1,000th dive of one of their twin manned submarines off the coast of Hawaii.

Scientists from the University of Hawaii and the Hawaii Undersea Research Laboratory (HURL) have now spent nearly 9,000 hours underwater around the Hawaiian Islands and U.S. Pacific territories since 1981, studying marine creatures.

Ken Longenecker swims down to the acrylic dome brought down by the Pisces V, and checks to make sure that the special pump is working correctly. The dome is used to apply a non-toxic stain to the Leptoseris coral head, to be used for measuring the growth rate of the coral over time.
Ken Longenecker swims down to the acrylic dome brought down by the Pisces V, and checks to make sure that the special pump is working correctly. The dome is used to apply a non-toxic stain to the Leptoseris coral head, to be used for measuring the growth rate of the coral over time.
Credit: R.L. Pyle.

This dive was a tad more crowded than normal. Nearly 500 students from more than 35 classrooms "virtually" accompanied the researchers.

During the dive, HURL researchers used their three-person submersible, named Pisces, to study coral reefs that occur in the deeper half of sunlit waters, called mesophotic reefs. Near Hawaii, these elusive corals live about 230 to 500 feet (70 to 150 meters) underwater. [Infographic: Tallest Mountain to Deepest Ocean Trench]

The R/V Ka‘imikai-o-Kanaloa launches the Pisces V over her stern, while the chase boat stands by.
The R/V Ka‘imikai-o-Kanaloa launches the Pisces V over her stern, while the chase boat stands by.
Credit: R.L. Pyle.

The submersible dove in the 'Au'au channel, off the island of Maui, during the mission. HURL operates Pisces IV and V, deep-diving submersibles capable of descending nearly 6,600 feet (2,000 m) below the water's surface.

The students were part of the Creep into the Deep program. They sent emails and shared photos and video with the scientists aboard Pisces V. This is HURL's third Creep into the Deep mission.

"My second-grade class is so excited to be part of this amazing virtual tour. We are grooming future scientists and with this experience I can see that your team has sparked the interest in my students," said Yvonne McCarty, a teacher at Felicita Elementary School in Escondido, Calif., whose students dove virtually. "Thank you for letting us set sail aboard with you. And congratulations on the 1,000 dives. Way to go!"