[bitwrangler]

it says it's rated to 40 meters, which is good for most recreational diving. This would not apply for deeper dives.

I'm curious to see what they have for using it with diver communication and collaboration. If one diver sees something of interest, they can easily notify other divers. I'm not sure if or how well Bluetooth works underwater?

The haptic vibration would be useful to notify about reaching maximum bottom time, and for decompression rest stops while ascending.

But I think I would still keep my traditional dive computer next to pressure gauge in my diving setup.

I wonder if they will have a wireless pressure sensor on the tank so you can also track air pressure and consumption? That would be neat.

[jitl]

Bluetooth doesn’t work underwater. Water loves to absorb 2.4ghz signals. I dive with both my iPhone and Apple Watch Ultra and they can’t communicate underwater unless they’re actually touching.

[sarpeedo]

Curiously, 2.4ghz light corresponds to microwaves which is actually long wavelength low energy light. If you have a video stream on while the microwave oven is turned on you'll notice large enough interference to disconnect your stream.

The fact that water absorbs 2.4ghz light is what enables microwave ovens to heat water in the first place. So while it's an inconvenient property during dives, it's very convenient in the kitchen.

[scrumper]

Oh that's interesting. Made me go digging. It turns out those air integration wireless tank sensors use very low frequencies, 38kHz. MH8A is the relevant FCC ID.

[shkkmo]

> I'm not sure if or how well Bluetooth works underwater?

Water tends to block most radio signals pretty quickly. If you are trying to wirelessly transmit data underwater you get much, much better range with sound than you do with light.

[iamacyborg]

> I'm not sure if or how well Bluetooth works underwater?

It doesn’t, which is why heart rate monitors intended for swimming activities have on-board storage.