Sam is thinking about how to escape, he doesn't know what will happen if he just entered the water directly.
If he were to be crushed again as soon as he entered, then there is nothing he can do, and has to go back into the dimension. He is truly in a pickle.
The whirlpool is too aggressive for him to swim upwards easily. If the ice figure once again comes into action as soon as he entered the water, he would have to suffer some serious injuries all over again.
After some thinking, Sam decided to try something which he didn't know would work.
Under the water, an energy cell appeared under the crystal of divine dimension.
Even though he is confident that these energy cells couldn't damage it, he is still nervous as he did this. The energy cell blasted as soon as it appeared and the crystal was shot up along with large amounts of water.