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