Exactly a century after it became the first ship to be sunk by a U-Boat torpedo, the HMS Pathfinder has been marked with a wreath at its underwater resting place.

Divers swum 220 feet (68 metres) down off Scotland's east coast to commemorate the anniversary - filming the touching event on a GoPro camera.

They made their way through the murky waters off St Abb's Head, before coming across the rusted remains of the once great warship.

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The HMS Pathfinder, which became the first ship to be sunk by a U-Boat torpedo 100 years ago

The unorthodox ceremony was commissioned by the Royal Navy, and was dedicated to the 250 crew members who lost their lives on the boat during World War I.

It was initially thought that the HMS Pathfinder had been blown up by a mine - but was later confirmed to be a torpedo from a U-Boat commanded by Otto Hersing.

Hersing went on to become one of the Germans' most successful U-Boat commanders, earning himself the nickname 'Zerstörer der Schlachtschiffe' - or 'Destroyer of Battleships'.

Captain Chris Smith RN laying a wreath on behalf of the Royal Navy and Royal Marines lost on HMS Pathfinder

The Royal Navy and Royal Marines remember HMS Pathfinder from onboard HMS Example

The Royal Navy P2000 patrol boat HMS Example meeting Wavedancer II

There were just 18 known survivors - including the captain - Lieutenant Commander Francis Martin Leake, who escaped wounded.

Lieutenant Edward Oliver Stallybrass (then Sonnenschein) also survived the sinking, and recounted: 'The ship gave a heavy lurch forward and took an angle of about forty degrees down by the bow.

'Water came swirling up to the searchlight platform.

'The Captain said: "Jump you devils jump!"

'The Captain and his secretary remained with the ship until the very end but somehow both survived'

The Stern family, who laid a plaque over the wreck site to remember William Stern - a stoker on board

William Stern, who died on board (left) and a plaque made to commemorate his death

The ship was struck on the starboard side under the bridge from 1,500 yards (1,372 metres) while patrolling waters off southern Scotland. The forward magazine exploded, the bows were blown off and it sank in around four minutes.

Author Aldous Huxley, who wrote the English classic 'Brave New World', actually witnessed the moment the ship was struck.

He said in a letter to his father: 'There was not a piece of wood, they said, big enough to float a man - and over acres the sea was covered with fragments - human and otherwise.

'They brought back a sailor's cap with half a man's head inside it.'

The wreath was presented to the team of British Sub-Aqua Club divers by Paul Ratcliff - a 74-year-old from Canterbury who lost his uncle in the disaster.

A portrait of German Commander Otto Hersing, who sunk the ship from the U-Boat (furthest right)

Bill Austin never met his nephew, as he was just 19 when he was killed on board the ship, but Mr Ratcliff was especially keen to honour him, as his body was never recovered and he has no grave.

Because of difficulty travelling, his grandparents were unable to make it up to Scotland to remember their son, so when he heard about the commemorative dive he requested that the wreath be placed.

A plaque was also laid over the wreckage site by the Stern family, to remember William Stern - a stoker who died on board the Pathfinder.

Despite the sinking being plainly visible from the shore, British authorities tried to cover it up, and claimed the ship was destroyed by a mine.

However, The Scotsman published the report of a fisherman who helped with the rescue, revealing the truth that the boat was shot down.

The HMS Pathfinder was a 385-foot (117-metre) long Pathfinder-class scout cruiser. It had a top speed of 25 knots and had 15 guns and two torpedo tubes.