User blog comment:Matt Hadick/Ultimate Battle Final Round/@comment-3309558-20130708221126/@comment-4738647-20130709105635

All of the Transformers aboard the ark laid dormant for 4 million years without rusting, he isn't made of magnetic material like steel, iron or nickel, he is an alien. It took a volcanic eruption to wake them up and they survived that too.

In the last episode of season 1 all of the Decepticons fall into a pit of lava and acid and say "We shall rise again" and rise again they did for they came back in season 2.