An apparatus to refuel a vessel with cryo-compressed hydrogen, the apparatus comprising: a mixing tank; a cryogenic pump connected to a liquid hydrogen supply tank; a defueler valve, a refuler valve, and a proportional valve connected to hydrogen storage tanks, the proportional valve downstream of the hydrogen storage tanks; a vaporizer connected to the cryogenic pump via the proportional valve; a refueler controller configured to: control the defueler valve to defuel the vessel prior to a refuel process based on a pressure of the vessel; fill the mixing tank with at least the cryo-compressed hydrogen based on the pressure of the vessel and a pressure of the mixing tank, wherein the mixing tank is connected upstream of the vessel and is structured to include the cryo-compressed hydrogen; control the refueler valve to initiate the refuel process of the vessel; control the proportional valve to adjust a temperature of the mixing tank in response to a temperature of the vessel not satisfying a target temperature of the vessel during the refuel process, wherein the temperature of the mixing tank is to be adjusted based on an increase or a decrease of flow of supercritical hydrogen; and end the refuel process in response to the pressure of the vessel satisfying a target pressure of the vessel. a mixing tank; a cryogenic pump connected to a liquid hydrogen supply tank; a defueler valve, a refuler valve, and a proportional valve connected to hydrogen storage tanks, the proportional valve downstream of the hydrogen storage tanks; a vaporizer connected to the cryogenic pump via the proportional valve; a refueler controller configured to: control the defueler valve to defuel the vessel prior to a refuel process based on a pressure of the vessel; fill the mixing tank with at least the cryo-compressed hydrogen based on the pressure of the vessel and a pressure of the mixing tank, wherein the mixing tank is connected upstream of the vessel and is structured to include the cryo-compressed hydrogen; control the refueler valve to initiate the refuel process of the vessel; control the proportional valve to adjust a temperature of the mixing tank in response to a temperature of the vessel not satisfying a target temperature of the vessel during the refuel process, wherein the temperature of the mixing tank is to be adjusted based on an increase or a decrease of flow of supercritical hydrogen; and end the refuel process in response to the pressure of the vessel satisfying a target pressure of the vessel. control the defueler valve to defuel the vessel prior to a refuel process based on a pressure of the vessel; fill the mixing tank with at least the cryo-compressed hydrogen based on the pressure of the vessel and a pressure of the mixing tank, wherein the mixing tank is connected upstream of the vessel and is structured to include the cryo-compressed hydrogen; control the refueler valve to initiate the refuel process of the vessel; control the proportional valve to adjust a temperature of the mixing tank in response to a temperature of the vessel not satisfying a target temperature of the vessel during the refuel process, wherein the temperature of the mixing tank is to be adjusted based on an increase or a decrease of flow of supercritical hydrogen; and end the refuel process in response to the pressure of the vessel satisfying a target pressure of the vessel.