Answered my own question. From the YouTube description:
"Here is 150 kg exlosives blown up to make a hole from the lake at 410 m. over sea level to a tunel leading to a hydro powerstation at sea level. It takes about 5 min for all air in the tunel to escape up in the lake and making serius bubles and waves."
As you can see, gentlemen, I was not lying about my new weapon's capabilities. Do my demands seem laughable to you now? You will pay me 10 billion dollars, or I will do the same to the world's oceans!