Sir Sean Connery spent time underwater aboard the U.S.S. Puffer (S.S.N. 652) preparing for his role. He was given Commander status, and allowed to give commands while underwater (with the Captain beside him).
After the release of Tom Clancy's novel "The Hunt for Red October," some members of Congress contacted the CIA, demanding to know why the Russians had invented a caterpillar drive before the U.S. Navy did. Although a result of good research, the caterpillar drive is pure fiction.
During filming, several of the actors portraying U.S.S. Dallas crewmen took a cruise off the coast of San Diego on the U.S.S. Salt Lake City (S.S.N.-716) a real Los Angeles-class submarine. To help Scott Glenn train for his role as the Dallas's commander, the real commander of the Salt Lake City, Thomas Fargo, ordered his crew to treat Glenn as equal rank, first giving reports to Fargo, then give the same report to Glenn. Glenn based his performance of Captain Bart Mancuso on Commander Fargo, giving orders in a calm, even voice -- even in tense situations; saying, "whatever good happened in the performance, basically I owe to now Admiral Fargo, thank you sir."
Alec Baldwin stated that it was this role that effectively launched his big-time career. Although he had prior movie successes, most were in smaller roles or cult movies, and he was therefore a considerably lesser known actor before landing the role of Jack Ryan.
The fighter crashing into the flight deck was stock footage of a F9F Panther test flight in 1951. This particular aircraft was piloted by official test pilot George Chamberlain Duncan (1917-1995). Duncan survived the crash with minor burns, and after a few months, he was back flying again.
John McTiernan Sr.: During Jack's briefing for Jeffrey Pelt, the director's father as one of the advisors in attendance.
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