Inverted twin cylinders

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And take a deep breath here, please.

Things are getting a little TOO heated.

Just a note from one of your friendly neighbourhood Mods.
 
Inverted tanks are a favo(u)red configuration of the Royal Navy, but then again what do they know? :D

Everything that's old is new again. Here's a link to a story that's been posted on Scubaboard a few times before.

Marc
 
https://www.shearwater.com/products/perdix-ai/

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