Catastrophe of 2028.

In March 2028, The Trident Submarine, boasting the world's best Submarine depth capabilities found an unusually large, presumed dead corpse of what appeared to be some kind of Kraken/Giant Squid when they were on an expedition of the North Atlantic ocean. Upon trying to retrieve a sample, the creature reawakened and let out a low-pitched roar which sent earthquakes all across Earth. This caused worldwide panic, as soon after the severe Earthquakes had arrived, large cracks started forming in the ground. These cracks widened greatly, until nuclear bombs were dropped inside to prevent anything from coming out of the cracks. Inevitably, this seemed to anger the beast inside,causing it to lash out and completely destroy Earth's crust. What little humans remained took refuge on Mars until 2110, until they finally came back to Earth in 2116 in to cause The Battle of Tentacle Forest. In the Human's absence, Squid, Octopus and other Ocean-based life forms, being the only survivors, evolved and adapted until they were intellegent, sentient beings. What used to be the earth's core, (as the Earth was now completely ocean save for a few islands and Tentacle Forest) was destroyed in 2097 by the previous destructor of Earth, the Megasquid, and began The Earth Colonisation of 2097.