Submarine simulator.
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Previously:
https://www.homemadetools.net/forum/...964#post164328
https://www.homemadetools.net/forum/...570#post162695
https://www.homemadetools.net/forum/...499#post162333
https://www.homemadetools.net/forum/...357#post154472
https://www.homemadetools.net/forum/...014#post149186
https://www.homemadetools.net/forum/...4385#post79850
https://www.homemadetools.net/forum/...562#post166750
https://www.homemadetools.net/forum/...2209#post75951
https://www.homemadetools.net/forum/...209#post133000
https://www.homemadetools.net/forum/...209#post141732