A 12-year-old miss and a 17-year-old lad who died aft being pulled from the oversea disconnected Bournemouth formation had "no carnal contact" with a vas connected the water, constabulary said.
Dorset Police said it was inactive "investigating the circumstances that caused a fig of swimmers to get into difficulty".
Eight different radical were treated for non-life-threatening injuries aft exigency services were called astatine 16:32 BST connected Wednesday.
A antheral successful his 40s, who was connected the h2o astatine the time, has been arrested connected suspicion of manslaughter.