Grey district aquatic centre staff were astonished this morning when a four-year-old boy arrived for an early morning dip.
The boy was alone when he turned up at the pool just after 7am, dressed but without a towel or swimming togs.
According to a pool spokesman, the young lad was not upset or worried, "he was coming for a swim".
Police were called and while pool staff were waiting for them, they entertained the boy and let him play games on their computer.
Greymouth police Constable Damon Monks said the boy's grandmother was contacted and she quickly collected him from the aquatic centre.