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The three-person submersible Clelia is launched from an A-frame crane. The Clelia can cruise at 3 knots and is certified to operate at a maximum depth of 1,000 feet.
Scientists have maximum visibility in the Johnson-Sea-Link's acrylic sphere, which can accommodate four people, dive to 3,000 feet and travel at 1 knot.
Woods Hole Oceanographic Institution's autonomous underwater vehicle, the Autonomous Benthic Explorer (ABE). Developed in the mid-1990s, the ABE can be programmed to monitor underwater surfaces for months at a time, during which it takes photographs and collects surface samples and other data. It weighs 1,200 pounds and has a cruising speed of 2 knots.