Question: Benjamin Briggs was the captain of a merchant ship  that was discovered deserted off the shores of which Island ?
Sentence (from "USNS Observation Island (T-AGM-23)"): USNS "Observation Island" (T-AGM-23) was built as the Mariner-class merchant ship "Empire State Mariner" for the United States Maritime Commission, launched 15 August 1953, and operated by United States Lines upon delivery on 24 February 1954, making voyages for the Military Sea Transportation Service (MSTS) until going into reserve at Mobile, Alabama on 9 November 1954.
Relevant evidence: No