Iron cannon lying on shingle under water
Iron cannon from the 'NW96' wreck discovered off the Isle of Wight. © Martin Pritchard
Iron cannon from the 'NW96' wreck discovered off the Isle of Wight. © Martin Pritchard

Three Exceptionally Rare Shipwrecks Off the Dorset Coast and the Isle of Wight Granted Highest Protection

The remains of a medieval ship made from trees felled over 750 years ago is one of three extremely rare shipwrecks that have been granted the highest level of protection by the Secretary of State for Culture, Nadine Dorries on the advice of Historic England.

The 13th-century Mortar Wreck discovered in Poole Bay in Dorset with its cargo of gothic Purbeck stone gravestones is the oldest known protected wreck in English waters where hull remains can be seen. Tree ring dating of the wreck indicates that the timbers used to construct the hull are from Irish oak trees, felled between 1242-1265, during the reign of King Henry III.

The survival of 13th-century vessels is extremely rare, and prior to this discovery, there are no known wrecks of seagoing ships from the 11th to the 14th century in English waters. The wreck was discovered by Trevor Small who has operated diving charters from Poole in Dorset for the past 30 years.

These fascinating shipwrecks can reveal so much to us about our national history and it is right that we protect them for future generations. The survival of the 13th-century Mortar Wreck is particularly rare, with timbers dating to Henry III's reign, and the 16th and 17th-century Shingle Bank Wrecks shed light on historical trading.

Nigel Huddleston, Heritage Minister

The other two exceptionally well-preserved shipwrecks which have been designated under the Protection of Wrecks Act 1973 are the 16th century Shingles Bank Wreck NW96 and 17th century Shingles Bank Wreck NW68, both discovered off the Needles Channel, Isle of Wight by divers Martin Pritchard and Dave Fox. The survival of pre-1700 ships is extremely rare, as is the unearthing of previously unrecorded wreck sites in the Solent, making these discoveries nationally significant.

These three shipwrecks from the 13th, 16th and 17th centuries are very important discoveries and deserve the highest level of protection. The 13th-century ship with its cargo of medieval Purbeck stone is fascinating because it is the earliest English protected wreck site where hull remains are present, while the Shingles Bank wrecks’ ordnance and cargo reveal a wealth of information about life and trade many centuries ago.

Duncan Wilson, Chief Executive Historic England

With the addition of these three wreck sites, there are now 57 Protected Wreck Sites in English waters. Their status means that divers need a special license administered by Historic England on behalf of the Department for Digital, Culture, Media and Sport to dive the wrecks. Their artefacts are protected and their condition is carefully monitored.

The Mortar Wreck

Finds recovered from the Mortar Wreck include two Purbeck stone gravestone slabs from Dorset, with two different gothic designs. They are in immaculate condition and the chisel marks can still be seen. These gravestones are found in church graveyards across the south coast. They are significant because they were pre-carved and are not blank slabs, which suggests demand for highly skilled stonemasons and their products.

Other finds include a large cauldron for cooking soup, a smaller cauldron, which would have once had a long handle for heating water and mugs covered in concretion – a hard solid mass that forms over underwater objects over time.

The gravestone slabs would have either been carved at the quarries or at a workshop and are unpolished. One of the slabs features a wheel-headed cross, an early 13th-century style, while the other features a splayed arm cross, common in the mid-13th century. Several Purbeck stone mortars used by millers to grind grains into flour have also been recovered.

One theory is that the ship may have been lost on its way out from the Dorset coast. Its destination is unknown. Historic England has been working closely with Bournemouth University and Trevor Small to investigate this wreck. Irish oak was widely exported for shipbuilding during the Medieval period and Purbeck marble gravestone slabs were widely used across the south of England and were exported to Ireland and the continent.

This wreck reveals the rich web of maritime trade and contacts in the Channel and Irish Sea in this period.

I was born into a seafaring family. I've skippered thousands of sea miles looking for shipwrecks from my home port of Poole. In summer 2020, I discovered what I believed to be an undetected wreck site. Recent storms had revealed something unknown on the seabed. I was granted permission to dive the wreck. The rest is history! I've found one of the oldest shipwrecks in England.

Trevor Small, who discovered the Mortar Wreck

Very few 750-year-old ships remain for us to be able to see today and so we are extremely lucky to have discovered an example as rare as this and in such good condition. A combination of low-oxygenated water, sand and stones has helped preserve one side of the ship, and the hull is clearly visible.

Tom Cousins, Maritime Archaeologist Bournemouth University

The Shingles Bank Wrecks

The Shingles Bank in the Needles Channel is a well-known navigational hazard for ships entering the Solent from the west. It is thought that both NW96 and NW68 became stranded on the banks before sinking.

Archaeological remains of these vessels include several cannons, a large anchor, at least 50 very large lead ingots with unidentified markings and stone cannonballs. The ingots are a fixed size and weight and would have been used as currency for trade – so they could be made into a variety of products including bullets, lead flashing on roofs and pipes.

Initial research suggests the lead ingots were cast from a furnace known as a ‘bole’. Boles fell out of use from around 1580, suggesting the NW96 wreck dates from the 16th or very late 15th century. This theory is supported by the presence of stone cannon balls, which were replaced with iron shot and were no longer used by the end of the 16th century.

Analysis of the cannons indicates that one of them was cast in Amsterdam between 1621 and 1661, which helps place the NW68 wreck as a mid-late 17th century armed vessel, probably of Dutch origin. This indicates that the ship could have been associated with the Battle of Portland in 1653, when the fleet of the Commonwealth of England was attacked by the Dutch Republic during the First Anglo-Dutch War.

The Netherlands was the maritime and economic power in the world during this period so this site could help further our knowledge of 17th-century seafaring activity.

The finds are being investigated by archaeologists from the Maritime Archaeology Trust and Wessex Archaeology, along with the finders Martin Pritchard and Dave Fox.

I am very pleased that these shipwrecks dating to the 16th and 17th centuries have been granted the highest level of protection. They are a remarkable find. Working with Historic England, volunteer divers and archaeologists, we will continue to investigate, understand and record these wreck sites.

Martin Pritchard co-finder of the Shingles Bank wrecks

It has been a pleasure to support Martin and Dave through the process of putting the sites forward for protection and we are thrilled to be part of the team that is working together to map and visualise these incredibly exciting Solent shipwrecks. High resolution photogrammetry models of the sites will be developed to form online interactives to enable anyone to virtually dive these sites, as well as the tools for Martin and Dave to continue important monitoring work over the coming years.

Julie Satchell, Head of Research Maritime Archaeology Trust

Congratulations to Martin and Dave - if it wasn't for them these important sites would probably still be undiscovered. They are a really good example of the major contribution that is still being made to our understanding of our amazing maritime heritage and to Historic England's work by recreational divers and wreck investigators. Yet another great example of what we can achieve when we all work together!

Graham Scott, Senior Maritime Technical Specialist and Subsea Superintendent Wessex Archaeology