The year given for this episode is 1978.
Anthony Brand (Sparks), Dick Tufeld (Newsman's voice)
Although "Sparks" is a common nickname for a radioman, viewers must have been puzzled to hear Anthony Brand addressed by the name associated with Arch Whiting.
The script for this baby is a chopped and channeled version of the 1961 Voyage movie. There is a fair amount of stock footage in this episode taken from the theatrical film, including the iceberg barrage, the sky effects, the divers on the sea bed, and the launch of the missile.
In the climactic scene, Weber steals a pistol from the gun locker in the control room and holds the crew at gunpoint. When the shot moves from Weber to the crew and back again, he's suddenly holding a different gun. The next time the shot changes to the crew and then back to Weber again as he is overpowered, he's once again holding the original gun!
At the end of this episode, Sharkey tackles Weber as the grenade goes off. There's a camera shaking explosion with lots of sound and loud music. Yet, minutes later, Sharkey is lying in bed with his hands clasped behind his head. And Sharkey does not generally appear in any episodes following (aside from stock footage). The reason for this is that Sharkey was originally killed at the end of this episode. Terry Becker and Irwin Allen had a dispute over salary and Becker left the show. However, Irwin could not find a suitable replacement for him and, after coming to terms, re-hired Becker. The final scene was hastily written and shot to show that Sharkey was merely "kinda busted up" and that Weber took the full force of the explosion.