The Neptune swimming aid is a prosthetic device that is geared towards leg amputees. Designed to attach to the remaining knee stump, the fin would then replace one's prosthetic leg.
Once in the water, one can expect greater propulsion and maneuvering ability with the Neptune swimming aid. Not to mention that you can also expect to look incredibly badass while gliding through the water with a fin instead of a leg.
Implications - This swimming aid is one of a few scientifically advanced innovations that are making the world a a more accessible place for amputees and those with severe handicaps. One of the major concerns for amputees is undoubtedly their inability to participate in activities they have come to love and enjoy, and the swimming aid is certainly a major step.