On: A submarine made from IKEA jar and legos

[JoeAltmaier]

How did it communicate underwater?

[catketch → JoeAltmaier]

Radio control will work in a pool. High angle helps and lower frequency transmitters work better than high (so 75MHz, not 2.4GHz). Salt water would absorb radio transmission so results would be much worse in ocean or salt water pool.

[JoeAltmaier → catketch]

Very cool! I did not know fresh water would propagate radio signals.

[stronglikedan → JoeAltmaier]

Same as any other rc sub, I'd presume