Blue Peter

Season 17 Episode 71: Episode 71

Gaping Gill Every year high in the Pennines local cavers build a dam to divert a stream and Britain's largest subterranean cave reveals its secret for just three weeks. Peter reports from 104 metres below the earth's surface at the bottom of Gaping Gill.

Genre:

Family

Seasons:

68

Episodes:

2050

Cast:

Quality:

HD

Duration:

25 min

First Air:

1958

Rating:

7.5