>>2210990FYI that specific platform isn’t a spar, it’s concrete base is attached to the seabed. It’s in the North Sea which is relatively shallow and it’s easier to moor stuff to the seabed.
Spars are found all over the Gulf of Mexico where the water is too deep to moor stuff
I took pic related of the Lucius Spar back in 2018 when I was working out there