{HEAD ~ Each tapered tunnel section} extends from the propeller section to a tunnel opening through a hull of {TAIL ~ the vessel} 
{ HEAD ~ Each tapered tunnel section } extends from the propeller section to a tunnel opening through a hull of { TAIL ~ the vessel }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL