Undated (AP) _ Excerpts, from the Navy inquiry, of the Thresher's last radio calls the morning of April 10, 1963:

- 9:02 a.m.: The submarine tender Skylark receives a garbled message from the Thresher, 1,000 feet below the surface: ''Experiencing minor difficulties.''

- Several minutes later: The Skylark receives messages saying the Thresher is ''exceeding test depth'' and ''attempting to blow,'' a term for resurfacing.

- 9:17 a.m.: Skylark radio operator hears ''the sounds of a ship breaking up - a dull muted roar,'' followed by silence.