Five years after a whale died in the River Thames, one of those involved in the attempted rescue recalls the events.
Mark Stevens, from the British Divers and Marine Life Rescue, based in Uckfield, East Sussex, worked to save the whale's life off the coast of Kent.
The 18ft (5m) northern bottlenose whale was first spotted in the River Thames in January 2006 and rescuers began an attempt to save it.
The whale died off Gravesend as rescuers transported it on a barge towards deeper water in the Thames Estuary.
The bones of the Thames whale go on display at the Natural History Museum at Tring in Hertfordshire.