Two North London police officers today described how they braved freezing temperatures to rescue a woman trapped in her car in a lake in Totteridge.
PCs Ryan Perry and Marc Cash plunged into the water and smashed one of the vehicle's windows, before pulling the woman to safety.
Paul Brand went to meet them.
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A post-mortem report found no traces of drugs or alcohol, and the evidence suggests Simon Brown was not taking photos.
The masked men used an angle grinder to tear through the lock.
Doing as little as possible in the first minute helps people regain control of breathing and increases chances of survival, says the RNLI.