Vigil - 1x3

: DCI Amy Silva confirms that Craig Burke did not die of a head injury but was poisoned . She discovers a strange substance on his lips that matches residue found on his clothing.

Crew members were allegedly high on drugs (LSD) while responsible for the sub's reactor. Vigil 1x3

: Wreckage from the sunk trawler Mhairi Finnea reveals that it was actually a US Los Angeles-class submarine , not a Russian vessel, that dragged the boat down while covertly tracking the HMS Vigil. : DCI Amy Silva confirms that Craig Burke

The incident resulted in the deaths of , which the Navy officially covered up as drownings. : Wreckage from the sunk trawler Mhairi Finnea

: Flashbacks provide deeper context for Amy Silva’s trauma, revealing she lost custody of her stepdaughter, Poppy , following the tragic car accident that killed her partner, Iain.

: Lt. Docherty admits to falsifying drug tests for the crew following the Florida incident, claiming she did it to protect the careers of her colleagues. Key Tensions & Suspicion