Lines and form are everything in diving. A dive is scored for its aesthetics as well as its technical finish, with pointed toes, straight legs, and clean water entry yielding higher ratings. A great diver will make a very difficult feat appear effortless, with little a splash at the finish. In addition to being beautiful to watch, high-scoring divers need strong lungs, since they are required to come up for air many times during a competition. In diving, one must also be able to swim. A poor diver who cannot keep up with his or her partner on the pool deck will be out of the competition before it has even started. A novice swimmer might have no problem staying afloat in shallow waters, but would likely sink like a stone in deep water without putting in any effort. In other words, someone who can't swim is not going to make it as a diver. Divers are judged on their performance in three events: platform, springboard, and synchro. The platform event requires each diver to perform three dives from a standing position using only their arms and shoulders. The third dive is used for scoring and may not be repeated. The springboard event is similar to the platform, except that the diver goes into the water headfirst and comes up kicking. The final event, synchrony, involves two partners entering the water at the same time and performing together.