Radios will not work, because radio signals cannot propagate any significant distance through water. Acoustic systems called underwater telephones have been developed for this purpose. Navy submarines use a specialized telephone system to communicate underwater. Similar to land-based systems, underwater telephone systems use microphones and audio amplifiers. Navy Imagery used on this website without endorsement expressed or implied.
These systems are designed for voice communications. What if one wants to send e-mail or surf the Internet? More advanced systems designed to transmit and receive digital data have been developed. Some of these are described in the next section, How is sound used to transmit data underwater?
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How do people and animals use sound in the sea? Why do sounds have certain properties? How will ocean acidification affect ocean sound levels? How does marine life affect ocean sound levels? How does shipping affect ocean sound levels? Spherical Spreading Propagation from a sound source array in the near field and far field Wave Front Propagation How does sound travel in shallow water? How does sound travel in very shallow waters? Then he invented his own. Richie had invented a toy that allows people to talk to each other underwater.
Words don't come out clearly and you have to be within a certain range to hear but it's one of a kind. His two hour speech resulted in his water talkies being placed in every Toys "R" Us store. Not long afterwards, Richie became the president of the four-person family pool toy company, Short Stack LLC - named after his favorite food, pancakes. First, Richie mounted a standard snorkel mouthpiece onto the tip of a conical, plastic soccer-field boundary marker.
Then, in a series of tests conducted in the family swimming pool, Richie found that he could keep water from flooding the device by including a blow valve in the cone and a plastic membrane in the mouthpiece. After a month of further modifications, his invention was a complete success, allowing people to talk to each other underwater from up to 15 feet away.
Richie concluded his presentation by using a fish tank to ask, underwater, for a purchase order, and he got it for 50, units. One of Barbara's business associates helped arrange incorporation, patent and trademark search, and manufacture. Although Richie's achievements had won him a great deal of attention in the media, from CNN to the Christian Science Monitor, he remained a kid at heart. For example, Richie canceled a scheduled June appearance on NBC's "Tonight Show" due to a conflict with a more pressing commitment: summer basketball camp.
That is as it should be, since not growing up too fast is the key to Richie's success.
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