Dallas Bienhoff was the special guest for this Space Show program. Our discussion with Dallas focused on building an on orbit propellant depot to enhance and facilitate the VSE program with NASA and to also serve the developing private sector space community. Dallas took us through all phases of building a propellant depot and we discussed the four most significant hurdles: the cost of space access, zero g fuel transfer, long term cryogenic storage, and the autonomous rendezvous and docking necessary for the depot.