During the early part of the 18th century British ship designers had made few significant advances in design, whereas French shipbuilding benefited from a remarkably creative period. At the time of the capture of Invincible, there was not one 74-gun ship in the Royal Navy. By 1805 at the Battle of Trafalgar, three quarters of British ships of the line were of this singular design and the 74-gun ship had become the backbone of all major navies of the world. Invincible was one of the first trio of a new and longer type of 74-gun ships. Until 1738, French 74s had been little more than 154 feet in gundeck length, carrying just thirteen pairs of 36-pounder guns on the lower deck, fourteen pairs of 18-pounder guns on the upper deck and eight pairs of 8-pounder guns on the quarterdeck and forecastle, with the balance of the 74 guns made up of four small 4-pounder guns on the poop. This was changed by François Coulomb's design for, launched in 1739 at Toulon. The gundeck length was stretched to 164 feet, and the four small guns on the poop were eliminated, replaced by new gunports for an additional pair of 36-pounder guns on the lower deck and an extra pair of 18-pounder guns on the upper deck. This new gun establishment became the standard for all subsequent French 74s. The next two ships, Invincible designed by Pierre Morineau and Le Magnanime designed by Blaise Geslain, were begun in early 1741 at Rochefort and were each even longer than Le Terrible.
Active service
At the First Battle of Cape Finisterre during the War of the Austrian Succession, Invincible was escorting a convoy of merchant ships when she was sighted by the British channel fleet of 16 ships of the line, which gave chase. Invincible attacked the British ships to give the convoy a chance to escape, and alone engaged six British warships. In the end with most of her crew dead or wounded she struck her colours. Gracious in defeat, the French Commander, Saint-Georges, handed his sword to Admiral George Anson. HMS Invincible sank in February 1758 when she hit a sandbank in the East Solent. The ship remained upright for 3 days after its grounding allowing the crew to safely escape.
Wreck site
The site of the wreck was rediscovered by a fisherman in 1979 and was designated under the Protection of Wrecks Act on 30 September 1980. In 1996 Amer Ved grounded at the wrecksite, although it is not clear whether or not this resulted in damage to the remains. In 2013 the wreck was placed on Historic England's list of ten most at risk heritage sites due to parts of the ship being exposed by changing seabed levels. In July 2016 it was announced that £2 million of the fines imposed for the Libor banking scandal would be used to fund an excavation of the wreck site. In 2015 Historic England undertook conservation of a number of organic objects, gathered by surface recovery and vulnerable to physical and biological decay, publishing the report in 2018. In 2016 Historic England commissioned Pascoe Archaeology Services to conduct a detailed photogrammetry survey of vulnerable and at-risk areas of the Invincible wreck site. In 2017, Historic England adopted a Conservation Management Plan for the wreck site. In December 2019the BBC was given a preview of some of the 2000 artefacts found at the site, due to go on display to the public in 2020 at Chatham Dockyard as part of a National Museum of the Royal Navytravelling exhibition. These include parts of the ship's hull, tobacco pipes and ceramic hair curlers.
