Tunnel to the other side of the world and find out where you'd come out.
.............and don't say you're a No Digger and wouldn't dream of it!!
https://www.antipodesmap.com/
I won't tell you where I'd be as it may spoil your fun.
I need to brush up on my swimming distance
Pleased I’ve taken up snorkelling
I had to put my postcode in. Isle of Mull put me somewhere in the Netherlands
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You must have taken a detour to see the windmills.
I thought of your snorkelling skills immediately.
From home it's a bit damp so switched to Reading where I am now - yup, still sea!
If you start digging in Bermuda, you'll strike Perth (Aus). It certainly shows how much of the southern hemisphere is ocean!
Another one underwater, off the coast of South America.
If you do it in reverse, Sydney is opposite the middle of the Atlantic, roughly where Atlantis was thought to be...