Question 1

What was the nuclear-powered submarine 'Hydronaut' originally built as?

Accepted Answer

It was originally built as the 'Submanaut' in 1956, a working scientific submersible for inspecting underwater pipelines, diesel-powered and carrying only two crew members.

Question 2

Which TV series did David McCallum star in that used the same sound effect as the radio signal in this film?

Accepted Answer

The noise emitted by Dr. Volker's radio signal is the same as the communicators from The Man from U.N.C.L.E., which also starred McCallum.

Question 3

What is the USCGC Diligence, seen at the beginning of the film, and where was it stationed?

Accepted Answer

It is a Reliance-class Coast Guard 210-foot Medium Endurance Cutter commissioned in 1964, beginning service at the Key West Coast Guard Station.

Question 4

Which TV series produced by Ivan Tors featured Brian Kelly, Marshall Thompson, and Lloyd Bridges?

Accepted Answer

Brian Kelly starred in Flipper (1964), Marshall Thompson in Daktari (1966), and Lloyd Bridges in Sea Hunt (1958); all were produced by Ivan Tors.

Question 5

What is the mission of the five-man submarine in the film?

Accepted Answer

The submarine plants sensors around the world's oceans to monitor for an impending earthquake.

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