Assassin's Creed 4 Shipwreck Black Trench. Animus fragments, underwater ...

AC4 underwater gameplay: Black Trench Shipwreck - collecting all underwater chests and Animus Fragments. Area: Castillo de Jagua - medium difficulty.
Abstergo challenge completed: survive 10 shark attacks.
Special items found: design plans: Flower Sails.
Edward Kenway in diving outfit using diving bell to recover underwater treasures from the Black Trench shipwreck. Dangers are all around: sharks, sea urchin, jellyfish. Hide in the seaweed patches or within shipwrecks to avoid shark attacks, swim around jellyfish to avoid damage, use air barrels for a breath of air.