We already have one. In fact, that's why I'm here right now. We were developing a teleportation device of sorts that could be used by the Red Army. Troop movements, logistics, even individual soldiers in combat. It operated on Dark Matter that we recovered back when the Tunguska Event happened. However, the device malfunctioned when we tested it, and sent everything within a 50 mile radius through what we assume was a wormhole, and dropped us on this planet. We tried to see if we could get it to send us back to our planet, but we had no Dark Matter left. We managed to contact an anonymous dealer and he got us a sample, but told us that there wasn't any more on this planet. So we took a chance and bought it. Some dumb bitch stalled me on my way back and nearly caused the destruction of this planet... Right now I'm waiting on results from the lab technicians to see if we can even use it anymore.