I got a tidal wave too... it took a lot of my people so all I had were 2 little boys and a handful of old people. Now the boys are old and it looks like my tribe will die. I'm sad because they were my first VV3 tribe and I had all the puzzles solved and was really close to getting all the collectables. At least I started a second game a while ago so I won't have to start completely from scratch. But it still is depressing.