A few more existing devices used for underwater communications are lights and rope tugs.
The proof of the particular device is in the pudding. Have friends who are divers get in the water and try it out, both as talkers and listeners. If this “tube” increases the air space so the diver’s voice resonates, it sounds like similar attempts in the past that haven’t worked very well.
I think the problems were:
- sound not transferring well from the device into and through the water,
- how to attach it to different regulators, and
- learning to produce clear speech with a regulator mouthpiece in the mouth, especially the B’s, M’s, and P’s.
Perhaps this is a breakthrough, though. If it works well, is strong, reliable, and inexpensive, there’s probably a market.
Caution: many divers will be skeptical of attaching a device to their life support equipment (even back-up equipment) that doesn’t come from a reputable regulator manufacturer. Therefore, the primary market might be established scuba manufacturers.