Why is the octopus monster of deep-sea legend so terrifying?

You have heard plenty of deep-sea legends, and deep-sea monsters come in many bizarre and varied forms; the more they are told, the more real they seem. It is said that the picture shows a deep-sea monster that takes on a whale single-handedly. Terrifying, terrifying...
History is full of legends about it, such as the various historical incidents of giant ships sinking.
It is a monster of legend, and one of the factors that gave rise to the kraken of Norwegian legend.
However, it is not some baseless rumor; it really does exist in reality: the Giant squid.
The longest known life cycle of the giant squid is about 5 years. The Giant squid is one of the largest invertebrates known to humankind. To date, only more than 250 specimens exist worldwide for study.
It is said to reach 18 m in length, and through advanced technological means, scientists have been able to observe its true appearance.
Our understanding of the sea, and of the creatures in the sea, is still very shallow. Perhaps even more gigantic beings exist. For example, the legendary giant octopus.
Get to know them, these gigantic creatures. The reason they can grow so large is mostly that they live far from human habitats.
Otherwise, such a big squid (calamari) could not fill the bellies of many food lovers either.
Some people say that whales are so big that the giant squid would surely be instantly killed. I do not think that is the case; squid have many tentacles and swim fast too. Compared with the giant squid, a whale is just a clumsy big fatty, and it breathes with lungs, so it cannot grapple with the giant squid in the sea for long, or else it will not be able to catch its breath!