Federal investigators have wrapped up their work looking at a dive boat that burned and sank off the coast of Southern California several weeks ago killing 34 people. ATF and FBI agents are done now on scene picking through the charred remains of the boat, but now they have to analyze everything they collected to figure out an origin and cause of the fire. It wasn’t expected that they would have known the cause right away by just looking at the boat. It was so badly damaged. Now it will take lab work and analyzing the evidence to figure out how the fire started.