  CL1777/76--USCG AUX.;  REPORTS A TUNA BOAT WRECK.  ABOUT 30 FEET OF THE BOW AND FORWARD DECK ARE VISIBLE.  THE VESSELS' MASTS STANDS ABOUT 30 FEET HIGH.  THE VESSEL IS ABOUT 290 FEET LONG WITH ALL SUBMERGED EXCEPT THE PREVIOUSLY NOTED BOW SECTION.    W