On: Building a radio-controlled submarine with automat...

[yardie]

Doesn’t work on any unlicensed frequencies. 2.4Ghz and 5Ghz are absorbed by water. Militeary submarines use VLF frequencies. With a mile long antenna. So tether is the only real practical method.

[jacquesm → yardie]

No idea why this got downvoted, it is 100% accurate.

[BugsJustFindMe → jacquesm]

It's not 100% accurate to say that tether is the only practical method. Untethered AUV/UUVs are quite common in the industry.

[yardie → BugsJustFindMe]

Please point them out. All the UUVs/AUVs I've found are either tethered to a buoy or completely autonomous and only transmit when the surface. In all practicality there is no completely untethered ROV on the market. Acoustic controlled UUVs are still line of sight.

[vbezhenar → yardie]

What about sound?

[yardie → vbezhenar]

They operate at 100s of bits per second not fast enough to transmit live video so your back to line of sight.

[BugsJustFindMe → vbezhenar]

Acoustic modems are indeed common in underwater applications.