I grew up in the '80s where there's a lot of these kind of post-apocalyptic post-comet post-whatever it was so that always captured my imagination a lot as a little kid that idea of getting access to secret places and being able to roam around where you're not supposed to.
In those days it didn't take much imagination to come up with something that required great lyric development skills. You just thought of an experience that you might have gone through and write it down.
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Melville brought to the task a sound knowledge of actual whaling much curious learning in the literature of the subject and above all an imagination which worked with great power upon the facts of his own experience.