A remarkable archaeological operation on the River Wear has successfully brought a potentially centuries-old cauldron back to the surface.
These pictures capture the recovery at Offerton, near Sunderland, from divers entering the water in challenging conditions to the moment the vessel was finally lifted aboard.
Underwater archaeologist Gary Bankhead and his team had spent months planning the operation after the cauldron was first discovered last September.
High winds forced the recovery to be postponed by 24 hours.
Debris washed into the river by the wind and spring tide left divers working in visibility which was at times almost zero.
After locating the site, the team cleared silt and debris before carefully manoeuvring the three-legged cauldron into a recovery cradle.
The remarkably complete vessel retains its three legs and handle and is covered in heavy concretion after its long spell underwater.
Have a look at a selection of images from the recovery operation:
The River Wear at Offerton, where the cauldron and hundreds of Roman whetstones have been discovered (Image: GARY BANKHEAD)
The team prepares for the recovery of the cauldron (Image: GARY BANKHEAD)
Swift Water Solutions Limited provided access to their flat-bottomed boat and pontoon free of charge, which was crucial to the operation (Image: STUART BOULTON)
The recovery team at work during the operation on the River Wear. (Image: STUART BOULTON)
The cauldron is lifted from the River Wear at Offerton following the successful recovery operation (Image: STUART BOULTON)
The three-legged cauldron after being removed from its recovery cradle (Image: GARY BANKHEAD)
Swift Water Solutions Limited provided access to their flat-bottomed boat and pontoon free of charge, which was crucial to the operation (Image: STUART BOULTON)
Members of the dive team work in the River Wear during the recovery of the Offerton cauldron (Image: STUART BOUTON)
Scenes from the operation to bring the remarkable archaeological find to the surface (Image: STUART BOULTON)
Historical caldron recovered from the bed of the River Wear in Sunderland. Photograph:Stuart Boulton/The Northern Echo (Image: STUART BOULTON)
Underwater archaeologist Gary Bankhead speaks to those gathered at Offerton after the cauldron was recovered (Image: STUART BOULTON)
Members of the recovery team with the cauldron after it was successfully lifted from the River Wear (Image: GARY BANKHEAD)
The recovered cauldron will now undergo specialist investigation to determine its age, construction and use (Image: GARY BANKHEAD)
The three-legged cauldron after being removed from its recovery cradle (Image: GARY BANKHEAD)
Observers watch as the team works from the recovery vessel during the archaeological operation (Image: STUART BOULTON)
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Its precise age remains a mystery, with Iron Age, Roman and early medieval possibilities to be investigated.
The cauldron has now been taken to the University of York for conservation. which will be followed by further scientific research at the Department of Archaeology at Durham University.
Analysis could help reveal when it was made, how it was constructed, how it was used and even what it once contained.