Don't worry AT that survey will be finished. Diving into that current looks quite intimidating to a non-diver like myself...
By the way, has the downstream sump experienced another dive in recent history? Much easier to go with the flow!
I'm not sure that's been dived since the early 1970s - by the late Derek Crossland, from memory.If so, that'd be well before our mutual friend who recently dived Water Butt Sump was born!The latest Northern Sump Index (2015) gives useful detail but an important reference is the 1975 NCC Journal. If you want I can look up the original dive log in the CDG Newsletter and post basic details on here?
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