Main theory on how British couple who washed up on lifeboat died trying to sail the Atlantic Ocean

An investigation in to the deaths of British couple Brett Clibbery, 70, and his wife Sarah Packwood, 54, is underway after their bodies were found on a remote island in the Atlantic Ocean - and experts have reportedly offered a possible theory on how this could have happened.

The couple had been on a voyage across the ocean in a solar powered vessel, having departed from Halifax, Nova Scotia on 11 June with the intention of making it to the Azores.

Intending 'to show that you can travel without burning fossil fuels' as Clibbery put it on a YouTube video, the couple were planning on using green energy to make their way across the Atlantic.

Packwood had said the voyage was 'probably the biggest adventure of our lives so far'.

Their trip was supposed to take 21 days, but they were reported missing on 18 June after contact with their boat was lost.

Brett Clibbery and Sarah Packwood were found dead on Sable Island in their boat's life raft. (Facebook)

The bodies of Brett and Sarah were found on 10 July on Sable Island, a small and sparsely populated piece of land in the Atlantic after their lifeboat washed ashore.

Sable Island has been dubbed the 'graveyard of the Atlantic' as, according to the Maritime Museum of the Atlantic, there have been over 350 recorded shipwrecks on the island.

Throughout the centuries, storms and fog have sometimes obscured the island, which sits around 300km south east of Halifax and is near to plentiful fishing spots.

In a post on social media, Clibbery's son James paid tribute to the couple, writing: "They were amazing people, and there isn’t anything that will fill the hole that has been left by their, so far unexplained passing.

"Living will not be the same without your wisdom, and your wife was quickly becoming a beacon of knowledge, and kindness.

"I miss your smiles. I miss your voices. You will be forever missed."

With an investigation underway into what happened to Brett and Sarah and DNA test on the bodies, it is hoped that there will be some explanation as to what happened to the seafarers.

An investigation is underway, and looking into the possibility that their vessel was involved in a collision with a cargo ship. (Facebook)

According to Canadian site Saltwire, one theory that investigators are looking into is the possibility that Brett and Sarah's yacht was struck by a cargo ship that did not notice them.

The site claims an anonymous source told them that the yacht might not have been able to get out of the way in time, or that the couple could have been below decks when a potential collision occurred.

According to the source, the Canadian Coast Guard and military aircraft are believed to have not spotted any sign of the boat or wreckage.

With the investigation being in early stages, it's just a theory as what is currently known is that their bodies washed up on Sable Island in their life raft.

LADbible has contacted Public Safety Canada for comment.