(1) In 1979 , he discovered about 30 experimental petroglyphs on Kahoolawe , which strengthened the case against the Hawaiian bombings .
(2) In 1979 , he discovered about 30 experimental petroglyphs on Kahoolawe , which strengthened the case against the Hawaiian bomb attacks .

Do these two sentences mean the same thing?

Pick your answer from:
[+] no.
[+] yes.
yes