[maxerickson]

Density of limestone is about 2.5, so the volume of floats would be about 2.5 times the blocks.

[yason]

I'm tired but isn't that just 1.5 times?

Tied together, a 1m³ block of limestone and a volume of 1.5m³ of floats displace 2.5m³ of water. Assuming the mass of the floats themselves isn't much then already that would lift 2.5 tons off from the bottom of the water pool.

[maxerickson]

Yeah, I got it wrong.

[MarcusBrutus]

Shouldn't that be 1.5X instead? Unless you are factoring in that limestone's permeable.

[mekoka]

Are you taking into account the surrounding water (density=1) in your calculations?