As I was a kid, I watched this one movie where I have forgotten most of it, I want to watch that movie again and I am asking for your help. Here's what I remember in as much detail as possible:
A man thought to be dead after an aircraft accident that crashes his plane into the sea was found alive by our protagonists.
An old sub is powered by a glowing necklace crystal from a female character given to her by someone important to her, as you can see from the image below, the necklace is placed in the star spot in a compartment on the floor and the triangle thing starts spinning.
The main characters are looking for some more of these white glowing crystals and in the end, they found a whole cave full of them. Then, finally, the villain tried to use more of these crystals to power up the sub again but none of the chunks fit into the star slot, ending his life.
The time when I watched it but (it is very hazy, I may be wrong): 2002-2006