seaQuest DSV - Season 1 - Eps 5: Treasures of the Tonga Trench
As the seaQuest undergoes inspection, Lieutenant Benjamin Krieg has a close encounter with an unknown life form while in a seaCrab in the Tonga Trench. When the creature lets him go, Krieg discovers a treasure trove of mysterious glowing stones; stones that may mean big money. However, is the bigger threat to seaQuest the greed that overtakes the crew or the unknown life form?
About seaQuest DSV

Title: seaQuest DSV
First Air Date: 1993-09-12
Last Air Date: 1996-06-09
Status: Ended
Rating: 7/10 (from 133 votes)
Language: EN
Seasons: 4
Total Episodes: 58
Network: NBC
Genres: Action & Adventure, Sci-Fi & Fantasy
Production Companies: Universal Television, Amblin Entertainment
Synopsis
In the early 21st century, mankind has colonized the oceans. The United Earth Oceans Organization enlists Captain Nathan Bridger and the submarine seaQuest DSV to keep the peace and explore the last frontier on Earth.
Cast

Michael Ironside
Captain Oliver Hudson

Jonathan Brandis
Lucas Wolenczak

Don Franklin
Commander Jonathan Ford

Michael DeLuise
Seaman Anthony Piccolo

Ted Raimi
Lieutenant Tim O'Neill

Kathy Evison
Lieutenant Lonnie Henderson

Elise Neal
Lieutenant J.J. Fredericks

Peter DeLuise
Dagwood

Frank Welker
Darwin (voice)