This puzzle appeared in Microsoft Puzzle Hunt A, whose theme was Atlantis.
This puzzle is a rebus dropquote. You have to figure out how to construct a rebus by dropping the three pictures in each column into the three spaces below in some order.
Solve the rebuses using standard rebus operations. That is, perform all operations from left to right, treat "+" as concatenation, and treat "-" as removing all the letters in the word on the right from the string on the left. Remove the letters of the subtracted word one at a time, always choosing the leftmost remaining letter that comes after the previously removed letter.
Each rebus produces a question with a single-word answer. Those answers have something in common. The commonality is related to the movie theme of the puzzle.