As most schoolchildren know, radio waves do not travel through saltwater. That is why divers can’t talk to or text each other without using clumsy wired devices. But now British firm Wireless Fibre Systems, based in Livingston, claims it has developed a wireless modem that works underwater. The signals produced can also be transmitted out of the water. This will allow divers to keep in touch with their boat, or permit autonomous vehicles to send data to a waiting vessel.
Saltwater conducts electricity so well that it short-circuits the electrical field of electromagnetic radio waves. So instead sound waves are…
