An early takeoff occurs when a relay swimmer leaves the block too soon. This happens if the feet lose contact before the incoming teammate touches. Electronic timing systems or officials’ eyes detect these tiny errors during the race. This mistake results in the immediate disqualification of the entire four-person team. A swimmer jumps into the water before their partner reaches the pool wall. Teams practice their relay exchanges for hours to avoid this specific technical error. Close finishes often tempt swimmers to leave the block at an unsafe time. Avoiding an early takeoff is more important than gaining a tiny speed advantage.