In a still from from a video animation provided by the United States Coast Guard an illustration of the Titan submersible, right, is shown near the ocean floor of the Atlantic Ocean, as June 18, 2023 communications between the submersible and the support vessel Polar Prince, not shown, are represented at left. (United States Coast Guard via AP)

Don Kramer, National Transportation Safety Board engineer, right, testifies Wednesday, Sept. 25, 2024, at the U.S. Coast Guard Marine Board of Investigation hearing into the June 2023 loss of the Titan submersible, in North Charleston, S.C. (Petty Officer 2nd Class Kate Kilroy/U.S. Coast Guard via AP, Pool)

This June 2023 image provided by Pelagic Research Services shows remains of the Titan submersible on the floor of the Atlantic Ocean. (Pelagic Research Services via AP)

Don Kramer, National Transportation Safety Board engineer, testifies Wednesday, Sept. 25, 2024, at the U.S. Coast Guard Marine Board of Investigation hearing into the June 2023 loss of the Titan submersible, in North Charleston, S.C. (Petty Officer 2nd Class Kate Kilroy/U.S. Coast Guard via AP, Pool)

FILE - Debris from the Titan submersible, recovered from the ocean floor near the wreck of the Titanic, is unloaded from the ship Horizon Arctic at the Canadian Coast Guard pier in St. John's, Newfoundland, June 28, 2023. (Paul Daly/The Canadian Press via AP, File)

Members of the Coast Guard's Titan Submersible Marine Board of Investigation listen during the formal hearing inside the Charleston County Council Chambers, Monday, Sept. 23, 2024, in North Charleston, S.C. (Laura Bilson/The Post And Courier via AP, Pool)

Don Kramer, National Transportation Safety Board engineer, right, testifies Wednesday, Sept. 25, 2024, at the U.S. Coast Guard Marine Board of Investigation hearing into the June 2023 loss of the Titan submersible, in North Charleston, S.C. (Petty Officer 2nd Class Kate Kilroy/U.S. Coast Guard via AP, Pool)

Don Kramer, National Transportation Safety Board engineer, right, testifies Wednesday, Sept. 25, 2024, at the U.S. Coast Guard Marine Board of Investigation hearing into the June 2023 loss of the Titan submersible, in North Charleston, S.C. (Petty Officer 2nd Class Kate Kilroy/U.S. Coast Guard via AP, Pool)

Jason Neubauer, U.S. Coast Guard Marine Board of Investigation chair, second from left, asks questions during witness testimony, Wednesday, Sept. 25, 2024, at the U.S. Coast Guard Marine Board of Investigation hearing into the June 2023 loss of the Titan submersible, in North Charleston, S.C. (Petty Officer 2nd Class Kate Kilroy/U.S. Coast Guard via AP, Pool)

Lt. Cmdr. Nicole Emmons, U.S. Coast Guard Marine Board of Investigation technical advisor, center right, speaks with board members, Wednesday, Sept. 25, 2024, at the U.S. Coast Guard Marine Board of Investigation hearing into the June 2023 loss of the Titan submersible, in North Charleston, S.C. (Petty Officer 2nd Class Kate Kilroy/U.S. Coast Guard via AP, Pool)

Gim Kang, special counsel for the Coast Guard's Titan Submersible Marine Board of Investigation, listens during the formal hearing inside the Charleston County Council Chambers, Monday, Sept. 23, 2024, in North Charleston, S.C. (Laura Bilson/The Post And Courier via AP, Pool)

William Kohnen, of Hydrospace Group Inc., testifies Wednesday, Sept. 25, 2024, at the U.S. Coast Guard Marine Board of Investigation hearing into the June 2023 loss of the Titan submersible, in North Charleston, S.C. (Petty Officer 2nd Class Kate Kilroy/U.S. Coast Guard via AP, Pool)

Lt. Commander Thomas Whalen, U.S. Coast Guard Marine Board of Investigation lead investigator, center, asks questions during witness testimony, Wednesday, Sept. 25, 2024, at the U.S. Coast Guard Marine Board of Investigation hearing into the June 2023 loss of the Titan submersible, in North Charleston, S.C. (Petty Officer 2nd Class Kate Kilroy/U.S. Coast Guard via AP, Pool)