PC Nathan Lucy swam out after the woman, who'd jumped into the water from the Red Jet terminal.
Man Beaten Unconscious In Southampton
Two men arrested in connection with a serious assault in Southampton have been released without charge.
Officers were called out around 5am on Saturday 21 September, to reports that a man had collapsed on the ground on Standford Street in the St Mary's area.
He was taken unconscious to Southampton General Hospital with a serious head injury and remains there in a stable condition.
An 18-year-old man and a 17-year-old man were arrested on suspicion of grievous bodily harm and robbery, but have now both been released without charge.
Police are continuing their appeal for witnesses and would like to hear from a man and a woman who were seen walking along Chapel Road a couple of hours before the assault. They spoke with a taxi driver who had broken down.
It's believed they may have witnessed the assault or seen the offenders in the area.
Anyone with information is asked to contact southampton CID on 101 or the anonymous Crimestoppers charity on 0800 555 111.
Dad-of-two Nick Medlin from Ventnor died after being assaulted outside the Rose Inn pub in the town.
A section of Parkstone Road will be affected between 9.30am and 4.30pm for three days.
A man's died in hospital after a crash in Eastleigh.
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