(CNN) -- One of the world's largest private superyachts is the latest to set sail on an expedition to uncover the secrets of a British battle cruiser lost during World War II.

Octopus -- a 414 foot megayacht -- was donated to the British Navy by Paul Allen, co-founder of Microsoft. Allen will fund the recovery and research expedition, sparing the British government any cost.

A previous expedition by Blue Water Recoveries, a deep sea shipwreck recovery company, located the wreck 11 years ago.

This week the recovery team will return to the wreck site with a two-fold mission: Retrieve the ship's bell and document the remains of the battle cruiser in the hopes of later determining what happened in the Hood's final moments....