[klmadfejno]

I give it 7 seconds before the children start pretending to drown at the bottom of the pool to summon the rescuebot.

[frobozz]

Yes, and that's the other thing.

To reliably distinguish between drowning and breath-holding, you need to wait (or have more context)

This device (which has to come out through a secret underwater hatch and propel itself amongst people) cannot be faster than a lifeguard who has spotted the questionable situation and put themselves close to it before making a decision.

[Humdeee]

I can see the famous kissing scene from Squints in "The Sandlot" movie remade once again.