Episode 12021-08-29
The premiere establishes the premise with economy and menace: a detective boards a nuclear submarine under duress, and within minutes the walls are closing in. Suranne Jones commands every scene.
Season 1 earned an 85% Rotten Tomatoes score and a Metacritic score of 73 from 12 critics; The Guardian called it 'a dense, sharply written absolute treat of a show about a murky, unseen world.'
Renewal: Series 3 was confirmed in February 2025 and filming began in September 2025, set at an Arctic research station with Suranne Jones returning. (BBC)
Indian OTT platforms do not publish per-title streams. This tracks reception across the run, not viewership.
| Season | Released | BollyMeter | Critics | Audience | Verdict |
|---|---|---|---|---|---|
| Season 12021 · 6 eps | 29 August 2021 | 8.0 | 85% | n/a | MUST-WATCH |
| Season 22023 · 6 eps | 10 December 2023 | 6.0 | 57% | n/a | ONE-TIME WATCH |
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The premiere establishes the premise with economy and menace: a detective boards a nuclear submarine under duress, and within minutes the walls are closing in. Suranne Jones commands every scene.
The season finale threads together its conspiracy threads with more coherence than expected, and the Silva-Longacre dynamic pays off emotionally. Not all the plot architecture survives scrutiny, but the tension holds.
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