That eventuality, however, won't only benefit those sitting at their desk. Submarines and ROVs already communicate by something like Li-Fi, though their data speeds aren't exactly impressive.

Silent, localized underwater communication is clearly something submarine captains could use to their benefit, but current tech tops out at one gigahertz. That's slower than even the crummier Wi-Fi connections out there, which is why underwater vessels tend to rely on acoustic systems.