Finally, Vieira has recently analysed the submarine paradox through both special and general relativity. In the first case, he showed that gravitomagnetic effects should be taken into account in order to describe the forces acting in a moving submarine underwater. When these effects are considered, a relativistic Archimedes principle can be formulated, from which he showed that the submarine must sink in both frames. Vieira also considered the case of a curved space-time in the proximity of the Earth. In this case he assumed that the space-time can be approximately regarded as consisting of a flat space but a curved time. He showed that in this case the gravitational force between the Earth at rest and a moving body increases with the speed of the body in the same way as considered by Supplee ( F = γ γ m g ), providing in this way a justification for his assumption. Analysing the paradox again with this speed-dependent gravitational force, the Supplee paradox is explained and the results agree with those obtained by Supplee and Matsas.