# How to calculate using counter balance to lift a mass from undersea to above seawater.

Question: How counterbalance and pulley system calculation will be? Do I need to consider buoyancy formula and also F=ma.

What kind of formula do I have to consider?

If so, you want something like lead (sealed to prevent contaminating the water) or some other metal...or concrete/stone.

Say your weight is 1meterx1meterx1meter, (one cubic meter, or 1000 litres), and weighs 2000 kilograms out in the air. 1000 litres of water that it will displace will 'float' it that much, so it will be 2000-1000 kilograms = 1000 kilograms underwater.

For this reason, a water-weight wont work when its submerged, because the water weighs the same as the water it displaces.