The back-engineered methods of flying are so far advanced from jets and rockets that they don't even create sonic booms.They rotate the molecules surrounding the craft at such high speeds that space junk is rendered harmless.They go underwater creating a wall or shell so the craft never gets wet(bubble) spinning at incredible speeds. The downside for us is the extreme radiation danger.I won't go into it inside vs outside the crafts.I can tell most people here love NOT knowing.
http://www.waterufo.net/ Delaware Naval investigator who specializes in covering water-related UFO's.
http://www.waterufo.net/images/image002mcf.jpg