The definitive answer is...,, "maybe". The weight of the blocks is countered by the weight of how much water they displace. I did a similar setup once using 100 lb cement bags, which cure under water. They were easy to move around under the water. If you just set them on the bottom, the boat may tug them around. I was able to bury the bags under the sandy bottom, then once the sand settled back in, they were really secure; kind of suctioned in. If I had to move them, I would have to dig them out.
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