This is Irwin Allen at his Irwin Allen-est. This whole show while entertaining is a recycling of a failed pilot and a bevy of canceled sci-fi series.
The failed pilot starred Glen Corbett and Lloyd Bochner. This was made in 1967. The TV movie came out in 1971.
The first thing you notice in the movie is the Flying Sub from "Voyage to the Bottom of the Sea". The next thing is Robert Colbert from "The Time Tunnel". Looking closely at Pacifica, this city beneath the sea, you will see the Jupiter II from "Lost in Space" as a dome sitting on top of a tower. The submarine "Seaview" is seen prowling the depths of the underwater streets of the city. Later we see Richard Basehart as the President of the US (VTBOS), Whit Bissel (TT) and Jame Darren as a scientist(TT). And the props -- computers, laser guns, radios, video telephones -- all recycled from his series from the '60s. The sound effects are familiar ones. The costumes are too.
Some throw away cameos were added -- boxer Sugar Ray Robinson and veteran actor Joseph Cotten (he was in "Citizen Kane" for god's sake). Even Edward G. Robinson's son is added for good measure.
The plot is cross between "Armageddon" (an asteroid is headed toward impact on the earth) and "Ocean's 11" (a heist of the vault containing the US's Fort Knox gold reserve and the "highly fissionable H128"). It is fairly pedestrian. The fun in this movie is seeing all of Irwin's old shows being brought back in some form. Voyage to the Bottom of the Sea, Lost in Space, Time Tunnel, and Land of the Giants were all canceled by the time this movie came out. Watch this one if you can find it.
