I’m obsessed with a historic shipwreck: it’s murky and dangerous but diving in the Thames, I feel like a detective

When exploring wrecked warship the London I can barely see six inches ahead, but I've dived 500 times to document and save the secrets of this vessel built by Oliver Cromwell

When I dive to the shipwreck of the London, a warship which was accidentally blown up in the murky waters of the Thames estuary in 1665, I dive in darkness. I can barely see six inches in front of me. And if I turn my torch off, I cannot see anything at all.

But I love it. I've dived to the London about 500 times and I only have to feel certain timbers of the wreck, and I know where I am.