PC Nathan Lucy swam out after the woman, who'd jumped into the water from the Red Jet terminal.
A3 Coach Crash Victim Identified
The third victim of the A3 coach collision last week has been formally identified by police as a woman from Liverpool.
Kerry Lynne Ogden, 23, of Maghull, died with another passenger, musician Michael Molloy, 18, also from Liverpool, and the coach driver, 63-year-old Colin Daulby, from Warrington.
The three were on the 52-seater vehicle heading back to Merseyside from the Bestival music festival on the Isle of Wight when it left the carriageway of the A3 near Hindhead, Surrey, and collided with an oak tree.
Post-mortem examinations on the three who died have been carried out but Surrey Police have not released the results.
An inquest into the deaths was opened on Friday and adjourned to a date to be fixed.
Three people remain in hospital.
A 21-year-old man is described as having suffered life-changing injuries and two people are in a serious condition.
An investigation is ongoing into the circumstances surrounding the crash which occurred just before midnight on September 10.
No other vehicles were involved and officers are working to establish whether the coach might have been overloaded, as despite there appearing to be 53 people on board, the vehicle only had 51 passenger seats.
Police said the road conditions and the weather were not thought to be a factor in the crash and the 16-year-old coach had only been on the road for around an hour after leaving Portsmouth.
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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