A lot of hearing-impaired people would be more active if they weren't afraid of damaging hearing aids that don't like the humidity of gyms or the dousings of personal watercraft.A waterproof hearing aidTampa Bay Times-  In response, Siemens has introduced what it says is the first waterproof hearing aid, capable of working as deep as 3 feet under water.The Aquaris can also be connected to a Bluetooth remote, called the Minitek, that streams audio to the earpieces, so a person could listen to music from a Bluetooth music player when swimming, for instance. Or an accessory microphone can be worn by someone you need to pay close attention to in a noisy room.A survey by Siemens found that of 500 hearing aid owners, 17 percent restricted their activity to avoid damaging their hearing aids. That is particularly hard on groups like hearing-impaired children and people who work at jobs where there is dust or grime, like farmers or steel workers.The Aquaris is available through audiologists nationwide for about $2,500.   [fblike]