Dredgers in a sunken world

The year is 2028 after a mass shifting in the world’s oceans took place in 1989 caused from an unknown source the world is left fragmented and ruined leaving the old world’s many treasures to be rediscovered and sold to the highest bidder. You and your buddy are two newbie dredgers looking to make a name for yourselves, after buying a cheap tug boat, some supples, and a couple cheap diving suits your both ready to face whatever comes your way.