Stuck on Shark Archipelago

[beth]

I found both valve now would like to know where to find the engery crystle? Please help. I love this game and very frustrated when stuck.
Beth

[Shazzy]

were and what is the enrgey crystal?

[jojob]

I also have both valves in but cant seem to go further. Any help here?

[berserker]

You need to arrange lights around mountain according to flowers on previous island.

[BARONRAE]

I have gotten to all Islands except middle Island. I am thinking I need to get there, but the sharks keep eating my guys. They do not behave after they learn to swim, hard to control.
I'm guessing that I give something or someone the shells and then the tower/statues light up?
I've lost about 30 explorers to the sharks now. Help!
Please give suggestions on the middle island and confirm what I do with these shells.
I have gotten a couple of the spheres and placed them, I did the valves, did the volcano puzzle, and gotten the yellow, pink, blue crystals; I haven't gotten whatever goes on the cement monument/wall thing yet.

[Guro]

Alas, your scouts have to hurry and swim to the middle island, while sharks are away.. Also sometimes you can grab your man to hand to save him.
Hope that help

PS You will need blue shells on middle island, and you can use green shells to "buy" tower in SE part of map.

[BARONRAE]

I got it. Good thing there is unlimited scouts!

[Beast]

Do you have the ability to swim?