The Basking Shark
When a space probe loses its parachute during reentry and plummets out of sight into the ocean's depths, the staff of Sealab is called on to locate it.
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More from this season
S1 E1
Deep Threat
An earthquake spells danger for Sealab when the recurring mass of shock waves ruptures exposed canisters of radioactive waste.
S1 E2
Lost
An approaching red tide has more than the fish in a panic - the murky oceanic flux, which initiates a process of oxygen depleting, could cut off the life support system of Sealab.
S1 E3
Green Fever
A red alert is signaled after a supply ship's concrete mooring, cast off during a hurricane, unwittingly strikes Sealab's control dome and splits a major section of the shell.
S1 E4
The Singing Whale
A new world opens up for Roger Cummings, a disabled boy whose father is doing research at Sealab, when Bobby befriends him and teaches him how to dive.