Two solid blocks, Block 1 and Block 2, each of mass \(M\), are completely submerged in a tank containing an incompressible fluid of uniform density \(\rho\). Block 1 has volume \(V\) and Block 2 has volume \(2V\), where \(M > 2\rho V\). The blocks are connected by a light, inextensible string that passes over a light, frictionless pulley mounted above the tank. Immediately after the system is released from rest, what is the tension in the string in terms of the given quantities and fundamental constants?