I watched Voyage to the Bottom of the Sea on TV when Channel 4 screened it on Sunday afternoons in the early 1990's.
The first series was black and white and the remaining episodes were in colour. It is about the Seaview nuclear powered submarine and each episode had a different story, including aliens, monsters and espionage.
The series starred Richard Basehart and David Hedison and was directed by the great Irwin Allen. The flying sub used in this series was to appear in Allen's 1971 movie City Beneath the Sea.
It would be nice to see this series again and for it to be released on Video/DVD.