Dad's Army - Season 5 - Eps 1: Asleep in the Deep
The pumping station of the reservoir has been damaged by a bomb with Walker and Godfrey trapped inside. Hodges is determined to overrule Mainwaring's rescue attempt until it's discovered the structure of the building is very unsafe and they draw lots to decide who is going to be the ones to dig the stranded men out. After successfully reaching Walker and Godfrey, the roof caves in and everyone but Jones ends up trapped in the underground bunker that is now filling rapidly with water. But does Godfrey have a solution that is more useful than asking to be relieved?
About Dad's Army

Title: Dad's Army
First Air Date: 1968-07-31
Last Air Date: 1977-11-13
Status: Ended
Rating: 7.4/10 (from 72 votes)
Language: EN
Seasons: 10
Total Episodes: 77
Network: BBC One
Genres: Comedy
Production Companies: BBC
Synopsis
Introducing the Walmington-On-Sea home guard. During WW2, in a fictional British seaside town, a ragtag group of Home Guard local defense volunteers prepare for an imminent German invasion.
Cast

Arthur Lowe
Captain George Mainwaring

John Le Mesurier
Sergeant Arthur Wilson

Clive Dunn
Lance-Corporal Jack Jones

John Laurie
Private James Frazer

Arnold Ridley
Private Charles Godfrey

Ian Lavender
Private Frank Pike

Bill Pertwee
ARP Warden Bert Hodges

Edward Sinclair
Maurice Yeatman

Colin Bean
Private Sponge

Frank Williams
Reverend Timothy Farthing