Deep Sea Survival for All: I Start by Summoning Cthulhu

[Micro grams + micro puzzle world view + decisive killing + non-invincible text + gradually become crazy in the middle and late stages! Yan Zai'an is a mental patient. At least that's what people said before the sea overturned the world. Later, everyone really fell into the deep sea as he said. [Deep Blue System Warning! The oxygen level of the swim bladder is dropping rapidly! Warn! Unknown impact, SAN value dropped rapidly! Discover the lost city! Warn! The current depth is -12,800 meters, and the third wave of geocentric heat wave is approaching! In an instant, people who were burdened with endless pressure began to struggle frantically, constantly rising toward their hoped-for homeland on the sea level to survive. And in the abyss, the earth and the sea are ten thousand meters. Yan Zai'an, who was driving a mini-submarine with twisted tentacles growing on his back, constantly hunting for prey, and constantly uncovering his own curse, finally understood—— It turns out that I have already become a weirdo...