Get a Life (1990)

S1E20 Neptune 2000

Title: Neptune 2000 Plot: At the age of 12, Chris took on a paper route to save up for a submarine advertised in a comic book. After a wait of about 400 weeks, the kit finally arrives. Excitedly, Chris and his dad assemble the sub, but during its first adventure in the bathtub, they find themselves unable to escape.