House of the Dragonseason 3 opens with an epic battle as Lord Corlys Velaryon (Steve Toussaint) and his bastard son Alyn of Hull (Abubakar Salim) lead Rhaenyra Targaryen’s navy in a battle against the Triarchy fleet attempting to break her blockade of King’s Landing. In George R.R. Martin’s books, the Battle of the Gullet is the bloodiest naval battle in the history of Westeros, and HBO spared no expense when producing the glorious spectacle. The set involved four boats, a dry tank, a wet tank, an underwater tank, and three million liters of water.