Perfect Sense, Part I Lyrics

Lyric discussion by live2daygone2morrow 

Cover art for Perfect Sense, Part I lyrics by Roger Waters

I think the nuclear sub in search of the garden of eden means that within a nuclear submarine, there contains the power to destroy modern civilization, and thus bring us back to the primitive days of the garden of eden. Going in search of the garden of eden in this case means to search for the end of civilization. It reminds me of an einstein quote, something about how he doesn't know what weapons world war 3 will be fought with, but world war 4 will be fought with sticks and stones.