Keeping Personal Property Safe
Because the Octopus had produced his own eggs in this circumstance, his attempt to protect them from predators resulted in the production of the milky tears. After giving birth to its offspring, an octopus will place its eggs in a safe spot to protect them from predators. As it turned out, it was on the rock wall of Monterey Canyon, which was a blessing in disguise.
In order to attain this goal, it will deny itself any resources and starve itself, including those provided by strange underwater robots, in order to accomplish its mission. Once it has given birth to the eggs, it will give up everything (even its own life) in order to protect and preserve them for future generations.