A major issue most logistics companies will face in the next few years is land scarcity. Is this the concern behind Amazon's recently filed patent for underwater depots? The plan would see underwater depots in lakes or reservoirs, with goods summoned to the surface by acoustic vibrations.
Amazon's underwater storage concept is still in the patenting stage and sounds very much out there. One question is whether acoustic vibrations will prove effective. More importantly, given the massive impact of shipping and military exercises on marine life, I worry about the negative impacts of such technologies on underwater ecosystems.