Fossil Fighters help

Hello. I'm stuck in the 4th area, the underwater area. I just saved Rosei from the Sharks, and she says something about a pirate ship, and know i don't know what to do next...

Break the bluish rocks at the upper half of the area, 3 of them should reveal holes. I broke 2 of them before I found the right hole (the other holes lead to a dead-end). For me it's the upper left rock that leads to the ship.Hope this helps. :)Oh, don't forget to check your journal whenever you're stuck. I've found this after I read it too.

Thanks, I followed your advice and combed the upper half. Boy that was irritating...