Pilot whale found dead after Thames rescue effort

September 23, 2026

A female long-finned pilot whale has been found dead at Canvey Island following a major operation to guide a pod of around 25 whales out of the River Thames and towards the North Sea.

The whale, measuring approximately 4.5 metres, was discovered ashore early on Sunday morning (20th Sept) after having briefly stranded alive at Canvey Island the previous evening.

British Divers Marine Life Rescue (BDMLR) said the animal had separated from the main pod during an earlier herding operation and appeared to be in distress. It briefly came ashore alive but was quickly washed back into the water before Marine Mammal Medics could intervene.

Despite shoreline searches continuing until dark, the whale was not seen again that evening.

A further search early the following morning, carried out with the local Coastguard team, located the whale ashore and confirmed that it had died.

BDMLR is now working with the Cetacean Stranding Investigation Programme to recover the animal for a post-mortem examination. The organisation said such examinations can provide important information about a whale's health, genetics and nutrition, while helping scientists develop evidence-based responses to future whale strandings.

Meanwhile, aerial searches are continuing with support from Civil Air Support to locate the remainder of the pod. BDMLR said it is hoped the whales have continued moving out into the North Sea.

Anyone who spots the pod is asked to report the sighting to the BDMLR rescue hotline on 01825 765546, providing the location and direction of travel where possible.

Six-hour operation to guide whales out to sea

The latest development follows a carefully coordinated operation on Saturday (19th Sept), when the Port of London Authority (PLA) and BDMLR began attempting to guide the pod eastwards towards the North Sea.

The operation began in Gravesend at around 7am, with a flotilla of boats travelling behind the whales and slowly encouraging them towards the Thames Estuary.

After approximately six hours and more than 20 nautical miles, the pod reached the outer limits of the estuary near Red Sand Towers and was travelling towards the North Sea, with monitoring support from Civil Air Support.

However, one whale became separated from the main group and showed signs of illness. Rescue teams remained with the animal in an attempt to help it reach deeper water.

The incident had already involved the death of another whale.

On Friday morning, teams from BDMLR, the PLA, Kent Fire and Rescue Service and the Coastguard found two whales in the shallows near East Tilbury — one alive and one deceased.

The live whale refloated on the incoming tide after dark and moved into deeper water, where it was believed to have been able to rejoin the wider pod.

The deceased whale was a female measuring approximately three metres. Its body was recovered for a post-mortem examination.

BDMLR said the presence of a debilitated member of the pod could potentially have contributed to the whales entering the unusual environment of the Thames.

The pod, consisting of long-finned pilot whales, was first reported in the River Thames on Thursday, September 17th.

The species normally favours cooler temperate waters offshore beyond the continental shelf in the Atlantic Ocean. Pilot whales are highly social animals that form close family groups, with several pods sometimes coming together in much larger groups.

The presence of pilot whales in the Thames and southern North Sea is considered highly unusual.

Throughout the incident, BDMLR and the PLA have monitored the whales' movements and condition while specialist rescue equipment was brought in from teams across south-east England and the Midlands.

Members of the public have also been asked not to approach the whales by boat, aircraft or drone, as additional noise, vessels and crowds could cause further stress and potentially increase the risk of stranding.

Anyone who sees the remaining whales is urged to report the sighting directly to BDMLR rather than approaching them.

The rescue organisation has thanked the PLA, RNLI, Kent Fire and Rescue Service, Coastguard, Civil Air Support and members of the public who have provided sightings and information during the ongoing incident.

BDMLR teams remain on standby should the remaining whales return towards the Thames.