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