I watched a survival show once and a guy showed how to get loose from an Octopus. If you try to just pull them straight off, you will not get them loose.Wow...no way. So how did he escaped from that?
He showed how you have to pinch hard on each side of each sucker and they will let go and come loose, one at a time, then move on to the next one.
I do not ever intend to be in that situation, but I do remember the show.