Mechanical engineer Nicholas Michel-Hart chainsaws through ice blocking the hatch to the nuclear submarine USS Connecticut last March. The boat surfaced through three feet of Arctic ice 200 miles north of Prudhoe Bay, Alaska, where the University of Washington’s Applied Physics Lab conducts underwater communications and sonar experiments for the Navy.
Locating subs in the Arctic is difficult because the jagged undersides of ice garble sonar tracking. So APL researchers brave –30 degree Fahrenheit temperatures every spring to test devices like Deep Siren, which uses satellites and acoustics to send messages through more than 100 miles of water. The weeklong experiments also increase the Navy’s visibility in the area. “The Arctic is governed by international agreements, but now that the ice is retreating it’s getting a lot more interesting,” says APL field engineer Keith Magness (observing, second from right). “Countries are trying to expand their coastline to claim resources, and this is one way the Navy maintains its presence.”