Power Pearl

Power Pearls are pearls found in Submerbia, a city located in Labyrinth. King Saline has large, five yellow pearls above his throne while Surff found a net of white Power Pearls large enough to hold two in his hand.

Powers and Uses
King Saline draws his electrical powers from the yellow pearls above his throne. Surff found a net of Power Pearls at a docking station in Labyrinth. He demonstrates that when two pearls are strike together they will explode in roughly five seconds, those two pearls promptly used to bomb Robotniks Robo-sub.

History
Dr. Robotnik wanted to conquer the underwater city of Labyrinth so he could have all the Power Pearls to power his robot army. He kidnaps Princess Bubbles to hold for ransom in exchange for the city and the Power Pearls. Surff, Sonic and Tails rescued Princess Bubbles and save the underwater city.

Trivia

 * Power Pearls function similar to Depth charges, an anti-submarine warfare weapon. It is intended to destroy a submarine by being dropped into the water nearby and detonating, subjecting the target to a powerful and destructive hydraulic shock.