An octopus movies to escape from a hole with a diameter of 3 cm

It is said that cats use beards to ascertain whether the width of a narrow place can pass through, but this octopus has begun to escape suddenly with his arms folded without checking whether it can pass through a 1 inch (2.54 cm) hole.

The playback of the movie is from the following.
Octopus escaping through a 1 inch hole


As it is a big octopus as it is, the base of the foot and the trunk do not seem to pass, but it is a molluscic truly.