Tsunamis are a type of geological natural disasters that occur when the Earth's tectonic fault lines shift, due to earthquakes or volcanic eruptions. Giant waves of water would come at high speeds and cause severe flooding to regions and places around the world. Bigger tsunamis are considered to be dangerous than average waves, which are known as mega-tsunamis.
After a massive solar flare caused the Earth's core to be heated up so high, the crust of the Earth became unstable and it caused the world to come to an end in 2012. Seismic activity began to increase worldwide due to the crust becoming even more unstable, which caused gigantic tsunamis to flood the continents as soon as the world's ending began. During the apocalypse, gigantic tsunamis at the height of 1500 meters, formed by the magnitude of the corresponding quakes began to flood the entire planet, causing all global ground communication to cease, as well the loss of electricity and radio relays.
When the apocalypse ended, the global floodwaters submerged the world's continents, while most of them started to recede, with Africa having been risen after being swept for 27 days.