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Because a fuel limpet requires a minimum of 50m underneath a ship in order to travel and attach, it's impossible to refuel a ship that has gone CR while landed on a planet's surface using traditional SOP. if the client is not CR, they simply need to provide 50-100m distance between the bottom of their ship and the planet's surface for the limpet to attach. They can either do this when the Rats are close or if they have enough fuel they can leave the planet's orbit before the Rats arrive, making it a normal rescue in space.
PC Planetary Rescues - Horizons Not Required
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