The tunnel thruster system includes {TAIL ~ a thruster propulsion mechanism} including a drive unit driving {HEAD ~ a transmission and propeller assembly} located within a thruster tunnel 
The tunnel thruster system includes { TAIL ~ a thruster propulsion mechanism } including a drive unit driving { HEAD ~ a transmission and propeller assembly } located within a thruster tunnel
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH