Hydrostatic bubble

Hydrostatic bubbles were underwater structures built by the Gungans of Naboo. The walls of those jewel-like bubbles were made of hydrostatic membranes capable of keeping water out while still allowing individual to pass through at certain portal zones. The city of Otoh Gunga, located beneath the surface of Lake Paonga, appeared as a glittering cluster of such bubbles.

Appearances

 * Star Wars: Episode I The Phantom Menace