manage-bde -off Volume {-ComputerName|-cn} ComputerName {-?|/?} {-Help|-h} Description: Decrypts the volume and turns BitLocker ...

manage-bde -off Volume
            [{-ComputerName|-cn} ComputerName]
            [{-?|/?}] [{-Help|-h}]

Description:
    Decrypts the volume and turns BitLocker protection off. Removes all key
    protectors when decryption completes.

Parameter List:
    Volume      Required. A drive letter followed by a colon,
                a volume GUID path or a mounted volume. Example: "C:",
                \\?\Volume{26a21bda-a627-11d7-9931-806e6f6e6963}\ or
                "C:\MountVolume"
    -ComputerName or -cn
                Runs on another computer. Examples: "ComputerX", "127.0.0.1"
    -? or /?    Displays brief help. Example: "-ParameterSet -?"
    -Help or -h Displays complete help. Example: "-ParameterSet -h"

Examples:
    manage-bde -off C: