My guess is that off camera he was sliding them in through the hole. I can tell because when they reach the water in the other side they lie there dormant. It’s common among sea creatures to sort of play dead after spending some time without water.
You can also tell by how the camera when he walks away is being held by a man because it is moving a bit so that would mean a guy was standing there an intire day
Guys.these are true.he uses tools as shown.i can do this in 10min.no need for 20men and truck,helicopters he did it on his own with that shovel.easy peasy