Thanks to everyone who took part, a great response
The shortlist is (including Mark's favourites):
1) Vulcan: The cast for the the new series of the Clangers begins to be revealed.
(I loved the Clangers as a kid )
2) cavermanmike: We must have been under water longer than we thought
Captain, there's an awful lot of sediment on this submarine
3) roo.walters4: Cavers find a foolproof way out of Wales during lockdown.
4) langcliffe: Finals of the UK Whac-A-Mole National Championship.
5) mrodoc: Is the pandemic over yet?
6) digscaves: Nature watch surprises a very rare creature, an active caver, emerging from a government subsidised isolation burrow. Please maintain at least 2m distance.
7) tobyk: After months of lockdown, these first few moments are a kin to lowering yourself in to a hot bubbly bath...it feels gooood...
8 ) IanP: Uh oh, can open, Skippys everywhere!
9) RogerW: Caverns measureless to man? It goes straight down and I'm standing on the b*~~dy bottom!
10) Duckditch: I?m standing on the shoulders of giants.
11) Topimo We hit the motherlode! There's 5000 more Berger books down here!
Over to Random.org and the winning number is 6 - digscaves - congratulations!!
Thanks again to everyone who took the time and trouble to enter.
More competitions coming soon - if you have a photo suitable for a caption competition, please PM me, thank you, Pegasus