This "Upward Falling Payloads" (UFP) program is actually quite clever. First of all, the Navy needs to plant autonomous devices like unmanned aerial vehicles (UAVs) inside of capsules across the ocean floor. From there, the device can hibernate inside of the protective capsule for years on end. When the Navy needs surveillance or ariel support, it can remotely trigger these devices, and they float to the surface. In other words, they fall upwards.