: Investigating the sudden illness of the navigator and conn officer, they discover the morning meal was spiked with syrup of ipecac, forcing the sub to surface dangerously in the middle of a civilian regatta.

I can also tell you about:

In the episode " Silent Service " (Season 4, Episode 16) , Commanders Harmon Rabb and Sarah "Mac" MacKenzie are dispatched to the USS Watertown , a Los Angeles-class nuclear submarine, to investigate a series of alarming "accidents" and sudden illnesses that have plagued the crew. The Story Aboard the USS Watertown

'The Silent Service' Season 2 Prime Video Review: Stream It Or Skip It?

: A crewman is killed when a high-pressure steam pipe fails—not due to age, but because it was precisely nicked with a scalpel.