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