He was history's most feared pirate, striking terror into seafarers as he cut a bloodthirsty swathe through the Caribbean and North Atlantic.

But new research has found that Blackbeard may be innocent of one of the most notorious charges against him.

For almost 300 years, the British pirate captain has stood accused of deliberately sinking his flagship, Queen Anne's Revenge, so he could swindle his crew out of their share of loot they had plundered.

But marine archaeologists, who are conducting a diving expedition on the vessel's presumed wreck, now believe it may have run aground by accident. They have even found evidence suggesting that Blackbeard made repeated attempts to rescue the stricken craft.