RE: The condition of the oil tank.
IIRC there was a video from WPVI Chopper 6 when they pulled the tank out and moved it into the tent. It appeared to be partially ripped open in an almost "hinge-like fashion." The post is on their Facebook page you just have to scroll as it was about 10 hours ago. It's titled "MISSING MEN SEARCH" an they even give the timestamp ~43 minute into the video where they pull it out.
Wish I knew how to post the link, but FB links are really weird.
ETA: Figured it out - https://www.facebook.com/6abcActionNews/videos/10154863004366378/
After watching the video, it does seem like there are some black things in the lower right corner of the side that is hanging. Are those guns or shadows or just an oil spill?