Emil Marcone's brother was found at low tide in this particular vehicle.
The Washed Up Badge is in the Fort Hades neighborhood in Port Oakes. From the Fort Hades marker, head due east until you reach the water. There is an old rusted blue car on your left. The badge marker is on top of that car.
Its coordinates are (-3,903, 16, -1,369).
Gladiator Badge Unlocked
When you obtain this badge, you will unlock the Mook Gladiator badge.