This is a full 47 minute documentary about an active volcano and the aquatic species which are able to survive near it, most notably the octopus. Many different octopus abilities are investigated. This is quite an interesting documentary and worth the watch. It is the only full documentary about octopuses that I've found online. Enjoy!
This video suggests that octopuses can actually hear the rumbling in the earth before the volcano erupts giving them time to flee.