Potholing/Caving!
No chance.
Are you scared of anything? have you ever over come a fear/phobia?
I ask this as I am petrified of frogs all shapes and sizes,
My eldest is now 28 but when she was 16 she was diagnosed with a clinical phobia of frogs and it took 18 months of Psychiatry to get over it.
She missed her 16th birthday because somebody accidentally used the word frog and she spent the rest of the day puking and confined to her bedroom.
After the first session we had to put the word FROG on 3 doors in the house but it took about 3 months before she would go through them.
It was then little steps and eventually every room in the house had toy frogs but she still wouldn't handle them.
It was a Thursday night when I kept on at her to pick one up and after about 3 hours she finally gave in, collected about 100 of them up and placed them all on the table but when Mrs Dimple came in she wouldn't believe it until she handled them again.
Her final session was with the Psychiatrist at a Garden Centre where they sat next to a pond full of frogs.
I don't like heights at all.
Also I wouldn't go into a cave and go through small holes for a fear of getting lodged somewhere and not being able to get out, no worries if the cave is large enough to walk in.
good on her though for getting over it. must have took a lot of courage