No boat has been found to be at fault for the deaths of two children at Bournemouth beach last month.
Sunnah Khan, 12, from High Wycombe in Buckinghamshire and 17-year-old Joseph Abbess, from Southampton died after they got into difficulty in the water at the Dorset resort on May 31.
At the time it was understood that larger than usual waves were seen in the sea at the time, with wash from a passing boat being suggested as a potential cause.