Old tricks are still new!....
Before the PWC was invented (oh, oh, ...I"m going to show my age here) I had a friend who lived on a lake in North Carolina, near Charlotte.
He had a 21 foot jet boat with a 454 cu.in. high output big block engine with a Berkley jet pump. That thing would fly. I remember the first time I went for a ride, he had that thing floored. I swear when he hit a ripple, we'd fly out of the water 50 feet or more.
Well, just when I thought the "fun" was maxed out, he pulled it down into reverse. The nose sunk into the water and a big "greenie" (sailor talk for wave) washed over the deck of the boat, soaked me from head to toe.
I think that was the last time I rode in his boat. That was in 1979. So, doing a submarine in a boat HAS been around a long time, even before they were doing it in the yet invented "jet ski"...........:rofl: