The rearward section includes {TAIL ~ an interior chamber} and an opening or channel that extends from the chamber to provide a water flow path between the chamber and the surrounding body of {HEAD ~ water} 
The rearward section includes { TAIL ~ an interior chamber } and an opening or channel that extends from the chamber to provide a water flow path between the chamber and the surrounding body of { HEAD ~ water }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD