Isn’t it? On a cell phone it demands that I drop what I’m doing at a moment’s notice and respond to your inquiry. Unless it is something time-sensitive, the call probably should have been scheduled or a text message would have served the purpose without demanding an instant response

But scuba spelunking gives you the worst of both. Easy to get lost, easy to get stuck especially because you have a big tank on your back, if you let silt kick up its easy to get turned around and lost in the cave, and of course you also have a limited air supply.