Besides the account given in the manual for Metal Gear 2, a call to George Kesler during the final battle mentioned a rumor that Big Boss lost his eye during the battle in Outer Heaven, alongside his limbs and his right ear before he was reconstructed as a cyborg under the Snatcher Project, referring to an earlier work by Hideo Kojima. In addition, although Kesler implied that Big Boss's supposed cyborg status made him invincible to Snake's abilities and attacks, Snake managed to finish him off with a flamethrower. This account was also included in the Metal Gear Solid 4 Database, and the novelization for Metal Gear Solid 4 by Project Itoh.