Decrypt BitLocker disk on Mac OS (tested on High Sierra)

decrypt-mount-bitlocker-disk

diskutil list # find the parition ID marked as Windows NTFS disk

# if ID is disk3s1, then, input disk password after running
sudo dislocker -V /dev/disk3s1 -u -- externalhdd/

# this will output partition reference
sudo hdiutil attach -imagekey diskimage-class=CRawDiskImage -nomount externalhdd/dislocker-file

# Create disk directory
sudo mkdir /Volumes/ExternalHDD

# if partition reference is /dev/disk4, then
sudo mount -t ntfs /dev/disk4 /Volumes/ExternalHDD/

# Disk should be accessible via Finder