Capt. Jamie Frederick, First Coast Guard District response coordinator, delivers a press briefing in Boston, Massachusetts, about the ongoing search for the 21-foot submarine Titan, June 21, 2023. The Coast Guard is searching for five persons after the Canadian research vessel Polar Prince lost contact with their submersible during a dive, approximately 900 miles east of Cape Cod, Sunday morning. (U.S. Coast Guard video by Petty Officer 3rd Class Briana Carter)