Hi Consider a space ship at rest in space, this ship is equipped with a bomb connected to two rings. Once the rings connected to each other, the bomb explodes making the ship also explodes. The proper distance between the rings is one meter. Now consider a conducting rod of proper length one meter too moving directly towards the ship with constant velocity (the rings and the rod are on the same line). The rod can fit in the rings but with some friction. According to the frame of the ship, the rod will be contracted in the direction of motion so that the rod will pass through the two rings without connecting them, so no explosion occur. According to the frame of the rod, the distance between the rings will be contracted, so the rod will connect the two rings, and the explosion will occur. Questions: 1) Will the explosion occur? 2) Does relativity allow that the explosion could exist in one frame, but not in the other ? Please note that this problem is different from the Barn-Pole paradox. Thanks for any replies.