Contains five stories in which Olly the submarine and his friends learn valuable lessons while staying overnight in a haunted ship, getting caught in the Kelp Forest, and having other adventures.

Olly wants to prove to Dr. Daniel what a great research sub he is by finding a special artifact for her in the Mediterranean Sea. Only Olly hasn’t yet learned the proper way to retrieve artifacts – and he almost ruins it!

The subs join Dr. Kate at the opening of the Shanghai Marine Museum. Skid joins them, but soon feels left out as Walter and the subs reminisce together.

Olly and Skid play a prank on Beth, fooling her into believing there’s a live Plesiosaur in a cave. But the prank backfires when Olly and Skid get the fright, and Beth spots a rare ‘living fossil’.

When Uma has a strange and sudden change of personality, Olly will have to ‘fess up' to a mistake in order to help his friend.

In the South China Sea, Olly discovers a cache of ancient porcelain china. But a mysterious diver persuades him to keep quiet about it.

While Dr. Kate is trying to talk a salvage operator into leaving an ancient shipwreck untouched, one of the salvaged artifacts goes missing, and Scopes is the prime suspect!

Ranger’s herd of squidlings leave his ranch to join a group of exciting, fluorescent squid from the deep – and Beth and Olly try to help Ranger get them back.

Skid sets out to prove that “anything the subs can do – he can do better.” In the process, he borrows some of their things without asking and ends up causing big problems for the subs and Uma who are trying to build a new Substation.

Olly and Beth set out to retrieve a downed satellite but Dirk beats them to it. Meanwhile, because of their love for old sci-fi movies, Skid, Brandt and Bobsie are convinced that the satellite has returned to Earth with more than just scientific information aboard.