Sentence 1: In 1979 , he discovered about 30 Hawaiian petroglyphs on Kahoolawe , which strengthened the case against the experimental bombings .
Sentence 2: In 1979 , he discovered about 30 experimental petroglyphs on Kahoolawe , which strengthened the case against the Hawaiian bomb attacks .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?