Twelve underwater speakers allow the performers in the water to hear and react to audio cues even when they are submerged.

And the underwater speakers are to be more than a half-mile down.

A woman called to say the center should play beluga sounds on underwater speakers.

It works by using what are essentially underwater speakers to emit one or several frequencies in a pattern of pulses at a certain volume.

He loved the Ritz's swimming pool with its underwater speakers.

The goal is to send sounds from underwater speakers across the Pacific at least once a day every day for two years.

Both of which feature underwater speakers, with telephones and wireless Internet access around the pool area.

This technique is considered non-lethal and has been developed using an array of underwater speakers.

Initially, the plan was to fire sounds from the underwater speaker across the Pacific Ocean at least once a day.

Coaches also use underwater speakers to communicate with the swimmers during practice.