That brown stuff is beeswax like glacierbaze said. It was put on no doubt after they towed it into shallow water so it couldnt sink. You can see the plume of mud in the propwash of the salvage towboat as they grounded the towed vessel. They would then have packed the cracks that caused the sinking with beeswax so they could pump the water out and float it to the launch ramp and get it on a trailer. That same thing can be done by divers while the boat is turned turtle so when it is pulled onto its' keel and stabilized with forward thrust by a towboat, a crew can get aboard and pump the vessel out as they make for land.It looked like someone was attempting to patch the cracks? What was that brown stuff?