I mention them in the lecture where diving cylinders were discussed.I only knew the answer from browsing on SB. We don't have them in the UK.
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I mention them in the lecture where diving cylinders were discussed.I only knew the answer from browsing on SB. We don't have them in the UK.
I mention them in the lecture where diving cylinders were discussed.
The reason I include it is when a club member goes diving in the States or the Caribbean they will come across them.That's a good thing to do. I've just googled so now I might recognise one. It wasn't what I imagined at all.