The U.S.S. Voyager makes a fascinating discovery, a massive ocean floating in space and populated by the Moneans, a maritime alien species. When Janeway learns that the Monean's deep sea home is losing containment, she offers Starfleet technological assistance, a modified, now seaworthy Delta Flyer piloted by an eager Lieutentant Tom Paris. But soon after Paris and Riga, one of the young Monean scientists, return from their deep sea exploration, Paris is accused of a stunning breach of protocol — with dire consequences.

Willie Garson (Riga)
Benjamin Livingston (Prefect)
Heidi Kramer (Megan Delaney)
Alissa Kramer (Jenny Delaney)

• The working title for this episode was "Down Deep."
  
• Captain Janeway demotes Thomas Eugene Paris to the rank of Ensign and sentences him to 30 days in the brig.
  
• This is the only actual appearance of the oft-mentioned Delaney sisters, who help out Tom and Harry with their Captain Proton adventure.
  
• Willie Garson plays Carrie's friend Stanford on HBO's "Sex and the City."