Revealing mistake: During the initial dive the hydroplane on the sail (conning tower) is pointing upwards. During a later dive the hydroplane is pointing downwards. Wouldn't one position cause the submarine to surface?

Voyage to the Bottom of the Sea (1961)
Plot summary
Directed by: Irwin Allen
Starring: Walter Pidgeon, Peter Lorre, Joan Fontaine, Barbara Eden
The supersub Seaview in the Arctic, is pummeled underwater by falling iceburg sections. Admiral Nelson (Walter Pigeon)& Capt Crane (Robert Sterling) discover the sky in flames, & learn the Van Allen radiation belt has caught fire. Before heading to a UN conference, they pick up a lone scientist, Alvarez (Michael Ansara). Watching for crew stress is civilian psychologist Dr Hillery (Joan Fontaine). At the UN, Adm Nelson & Commodore Emery's (Peter Lorre) plan to save the earth is rejected. The Seaview encounters a mine field, giant squid & persuing subs, head to the Pacific, to fire a special missle. Alvarez & Hilliard each have separate ideas to stop Adm Nelson & his plan.
P. Schlining





Answer: Admiral Nelson is puffing on cigars in a few scenes, and his cigars are even a source of dialogue in the film. Specifically, when his quarters catch on fire, the blaze is initially blamed on a lit cigar, to which Nelson angrily replies that he ran out of cigars before the fire ever occurred. So it's a pretty good bet that Nelson was carrying a cigar (or cigars) in his shirt pocket.
Charles Austin Miller