this post was submitted on 22 Jun 2023
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I mean, today, entirely seriously, I spent about an hour looking at used prices for air receivers for this exact purpose. You can totally get 250 gallon tanks rated to 300 psi that are about the right size to fit one person and all the electrical components inside. Cut off one end and replace it with an acrylic/poly-carbonate dome, add a keel, ballast system, and thrusters on the outside, cover it all with a fairing, and you're good to go!
I'm thinking I could prototype a functional sub rated to 150 m for around $10k. Totally worth it.
Trust me, I'm an engineer as well lol
I guess using propane tanks for submarines is fairly common
https://images.app.goo.gl/jdS5fZ4JaTrgquHv5
http://www.psubs.org/museum/museum_sfphotos/den_03.jpg
http://www.psubs.org/museum/museum_sfphotos.html
Oh neat! I started looking at propane tanks, then switched to air compressor receivers when I found ones rated for 300 psi, knowing propane is generally 100-200 psi. But now I'm finding some propane tanks rated for 600+ psi...sooooo...guess it depends?