Rescue the Tortoise

The dive deep down the sea was supposed to be a mere adventurous trip but it has turned out to be a rescue mission now. The first that catches your attention when you reach the bottom of the sea is a tortoise that is pressed down under a rock. It is making a desperate attempt to come out but it cannot because the rock is too heavy for the little creature. You will have to lift the rock to get the tortoise out of there but you will need some items for the purpose. In order to find the useful items you may have to solve some puzzles. All the best!