Originally Posted by HarryT
"In it's subterranean resting place". Possessive pronoun hence no apostrophe. "It's" is only ever an abbreviation for "it is" or "it has"; if you mean "belonging to it", the word is "its" with no apostrophe. None of the possessive pronouns - my, his, her, its, our, their - have an apostrophe.
True. But the usual way of indicated possession in English is by adding "'s" to the end, which is what causes the confusion.