The War Between the Land and the Sea S1E3 — The Deep

7.2

The War Between the Land and the Sea•Season 1•Episode 3

The Deep

7.2/10 · 893 votesDec 14, 202545 min

Ranked #3 of 5 in Season 1•+0.1 vs season avg

Discussion

Barclay makes a terrifying descent into the world of Homo Aqua. Back on the land, Kate stands alone as Downing Street conspires with the army to change the course of the war.

Directed byDylan Holmes Williams

Written byPete McTighe

Previous episodeE2 · Plastic Apocalypse Next episodeE4 · The Witch of the Waterfall

Seasons1

All 1

Season 1 Episodes5

Homo Aqua

Plastic Apocalypse

The Deep

The Witch of the Waterfall

E5 6.5

The End of the War

Cast4

Russell Tovey

Barclay Pierre-Dupont

Gugu Mbatha-Raw

Salt

Jemma Redgrave

Kate Lethbridge-Stewart

Ruth Madeley

Shirley Bingham

Crew3

Pete McTighe

Writer

Dylan Holmes Williams

Director

Adam Lyons

Additional Photography

Discussion

0 comments

Join the conversation

Share your take and reply to other fans.

No comments yet

Be the first to share your thoughts on this episode.

Episode Summary

"The Deep" is episode 3 of The War Between the Land and the Sea season 1. It scored 7.2/10 from 893 votes, ranking #3 of 5 episodes this season (season average 7.1). Directed by Dylan Holmes Williams and written by Pete McTighe, it aired on December 14, 2025.

Next: E4 · The Witch of the Waterfall Best of Season 1