Godzilla attacks NY & SF

This is just a fun topic that I wanted to bring up. Ok so we know Godzilla attacks NY & SF, but how does get from one coast to the other ? we know he doesn't fly. So did he walk all across the U.S. ? or did he swim all across the ocean through South America or through Central America or even swam all over the globe ? just to get to the West Coast Or East Coast & how long did it take him ?

What's your theory ??