Friend one side me on the other, not all that heavy. Drug into the water. Once in the water the wood had enough buoyancy to remove most the weight. I probably would sink with three blocks but I wanted to make sure it was level on the bottom. I used a rope and snorkeling gear to position it out kinda deep.

You could use two blocks and float/position it over your location and then place the last one inside to sink it or tie to a boat or other floating sytem to position it then release it to sink.

every year I cut down two small ever green trees and tis a block to the middle and lean over it one on each side, sorta like a tepee

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