Sea Hunt, Vol. 1 VHS
In this syndicated 1957-61 adventure series, Lloyd Bridges played scuba diving expert Mike Nelson, who used his aquatic skills to battle criminals and dodge threatening fish off the Florida coast. Featured here is "Mark of the Octopus," in which Mike tries to track down two missing geologists, but soon learns one has been killed by what appears to a giant octopus. The episode, originally shot in color, is presented in black-and-white. 27 min.

There were many volumes of Sea Hunt released on video that are now out of print.  These are often available at popular prices on eBay.   Use the link under "Find Related Merchandise" to search for them.

You can also find the 1956 Sea Hunt pilot episode, "Mark of the Octopus" with Lloyd Bridges on the DVD collection: 1950s TV's Greatest Shows