Seaview's sister ship, Polidor (lost in this story) is probably named after Polidorus, the son of Priam, King of Troy during the Trojan War.
They mention (more than once) that they are diving to 8 miles depth, but the depth gauges read 4000 ft. (not even 1 mile) when they should be over 40,000 ft.
This episode takes place in the 1970s.
Robert Doyle plays a character named Pryor. Less than a month later he will be on Pressure Point (1964), again portraying a character named Pryor.