There's no splashing to alert anyone that the child is in trouble. Emphasize the need for constant supervision. Never leave a child unsupervised near a pool. When adults become preoccupied, children are at risk. If a child is missing, check the pool first.
Seconds count in preventing death or disability.
Go to the edge of the pool and scan the entire pool, bottom and surface, as well as the pool area. Do not allow a young child in the pool without an adult. Do not consider young children to be drownproof because they have had swimming lessons. Children must be watched closely while swimming. Do not use flotation devices as a substitute for supervision.