The Gilstone as seen from the surface. Note the Bishop Rock lighthouse on the horizon.


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The wreck

In 1707 Admiral Sir Cloudesley Shovell was returning to England from the Mediterranean with his fleet of 21 ships, when disaster struck. They had miscalculated their position and ran onto the Western Rocks in Scilly on the night of 22nd October. Three ships, Eagle, Romney and Sir Cloudesley’s flagship Association, were lost – with only a single survivor (from the Romney).

The fireship Phoenix struck a rock and was eventually beached at New Grimsby (Tresco), where she remained for three and a half months undergoing repairs. Another fireship — the Firebrand – also struck the rocks but managed to get off again. Leaking badly, she made for the beacon of St Agnes lighthouse, but foundered in Smith Sound close to the island. Of Firebrand’s complement of 50 crew members, 25 — including Captain Percy — managed to reach the safety of St Agnes. About 1400 men perished in this incident, making it one of the worst disasters in British naval history. It was probably these events that led to the Longitude Act of 1714. Sir Cloudesley Shovell’s body was washed up on St Mary’s and was eventually taken to London for burial in Westminster Abbey. There are several local legends relating to the theft of rings and other items from his body.

At the beginning of the 18th century, there was no accurate way of determining a ship’s longitude at sea. On that night in October 1707, Sir Cloudesley had miscalculated his position and ran onto the Western Rocks. The loss of a Rear Admiral of England, along with four warships and at least 1400 men, brought the question of longitude to the forefront of national affairs and precipitated the Longitude Act – and Parliament’s promise of a prize for the solution of the longitude problem. This reward – the Longitude Prize — was eventually won by John Harrison for his invention of the chronometer

The ship

The Association was Sir Cloudesley Shovell’s flagship. It was a 90-gun second-rate English warship of 165 feet (50m) length, built at Portsmouth in 1697. The Association had a crew of about 680 under her captain, Edward Loades. 

Site history

The remains of the Association were discovered near the Gilstone Ledge by the Naval Air Command – Sub Aqua Club (NAC – SAC) in July 1967. Subsequently, a number of other groups worked on the site including a team led by Roland Morris and Blue Seas Divers. From about 1971 the site was buoyed and worked by Terry Hiron and Jim Heslin. A detailed plan of the site has been produced by Terry Hiron.

Rocky seabed, with the muzzle of a worn iron cannon sticking out from beneath a large boulder
Cannon poking out from under boulders

Many objects were raised from the site, including three bronze cannon, anchors, swivel guns, dividers, buckles, buttons, spoons, forks, rings, pocket watches, combs and large quantities of gold and silver coin.

Description of the site

Situated around the Gilstone Ledges in the Western Rocks, the site varies in depth between 5 and 40m and is located in deep rock gullies with large boulders.

Diver on the seabed standing in a deep, narrow gulley. The gulley sides are covered in seaweed
CISMAS volunteer Brendon Rowe. This picture gives you some idea of deep rock gulleys in which most of the wreck remains now lie.

There are over 60 iron guns, anchors and a number of iron concretions including iron shot. Some guns and at least one anchor have been removed from the site.

Muzzle end of an iron cannon protruding from beneath a large rock on the seabed
Many of the iron cannon on the site are now trapped beneath large boulders as you see in this example

Access to the site

Public access to the site is achieved by licence under the Protection of Wrecks Act. This licensing is currently administered by Historic England. The three dive charter boats operating in Scilly have annual licences to visit the protected wreck sites.

Corroded iron cannon, on the seabed which is covered in seaweed
All that remains visible of the Association on the seabed today are the iron objects: cannons, anchors and round shot. These are to be seen in rock gulleys such as you can see here.


Most of the artefacts and coinage were sold at a series of public auctions; one bronze cannon can be seen on Tresco in the Valhalla Collection, while another is on display at the Royal Armouries in Leeds. There are also a few items in the Isles of Scilly Museum on St Mary’s.

Cannon sitting on a rock strewn seabed inside a small cave formed by large boulders. This image is illuminated by torch light
Cannon in a cave lit by the diver’s torch
7.Diver holding a small underwater video camera and filming the remains on the seabed
Diving in the deep gulleys with an underwater video camera. This picture gives you some idea of deep rock gulleys in which most of the wreck remains now lie.

Historic England list entry

If you would like to find out more, view the Historic England list entry for Association.