Massive wave from the south

[Ragman42]

I was in the living room at my parent's flat in Lithuania and I could hear this roaring sound coming from outside. I looked out the window and I could sea this 15-20m tsunami like wave rolling down from the south, through forests. The wave hit the multi leveled building and the water filled the flat almost up to the ceiling.
I managed to escape somehow, but my parents were nowhere to be seen. I was approached by few men with gas masks and they took me to the basement.