The Navy began its search for the wreckage of an MH-60H Sea Hawk helicopter, similar to the one pictured, and its crew, which crashed earlier this month off the coast of San Diego. NavySept. 17 (UPI) -- The U.S. Navy began its deep-sea search this week for the remains of an MH-60S Sea Hawk helicopter and the remains of five sailors who died after the aircraft crashed into waters off the San Diego coast on Aug. 31. Estimates from the Navy's San Diego-based 3rd Fleet put the utility helicopter at 4,000 to 6,000 feet deep on the sea floor, The San Diego Union-Tribune reports. The MH-60S Sea Hawk chopper crashed while performing exercises with the USS Abraham Lincoln about 60 nautical miles off the coast of San Diego. They were assigned to Helicopter Sea Combat Squadron 8.