The swimmer who obstructs any other swimmer during the swim shall be disqualified.
If a foul endangers the chance of success of a swimmer, the judges shall have the right to allow him to compete in the next round. If a foul occurs in the finals, the referee can allow him to swim again.
On return a competitor shall touch the end of the pool or end of the track with one or both hands. Diving from the bottom of the pool is not allowed.
A swimmer who stands on the both shall not be declared disqualified, but he shall not move.
Only the swimmer who covers the entire course shall be declared the winner.
In relay race, the competitor whose feet have lost touch with the starting block before his or her partner, going ahead of him or her touches.