A cubical solid aluminium (bulk modulus = $$-V \frac{dP}{dV} = 70$$ GPa) block has an edge length of 1 m on the surface of the earth. It is kept on the floor of a 5 km deep ocean. Taking the average density of water and the acceleration due to gravity to be 10$$^3$$ kg m$$^{−3}$$ and 10 ms$$^{−2}$$, respectively, the change in the edge length of the block in mm is _____.