Ich habe schon über Backpulver nachgedacht, aber es kam mir nicht in den Sinn, es auf diese Weise zu verwenden. Vielen Dank!
[Translation via Google Translate by a Mentor]
So I've been thinking for a long time now about making a self-submersible boat out of a plastic bottle without electronics. It should resurface by itself after a few minutes. I was thinking that it might increase its volume. By slowly dropping weights down the bottle and opening flaps on the...