If two TARDISes occupy precisely the same point in the Vortex (such as from a failed attempt at Interlock), then Time Ram occurs. It is one of the most dangerous things that an operator can do with a TARDIS. During Time Ram the atoms making up two TARDISes occupy exactly the same space. The chaotic forces between the two overlapping ships will grow until one of them explodes. The most likely outcome is that both TARDISes will be destroyed, as well their Eyes of Harmony. This will result in the uncontrolled release of enough Energy to destroy most of a solar system.

There is, however, there a small chance that one of the TARDISes will evaporate and the other will survive. In this case the energy released would only destroy all matter in a 2.4 km (1.5 mile) radius.