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anchors with a forging date of 1649, each weighing about 3 tons, other items recovered included a bronze butterfly hinge, pottery sherds, copper plates and nails, chain links, capstans, plankings and the center bolt of an auxilliary mast (Lopez 1967). Underwater archaeological activities by the National Museum were not started again until 1982 (see The 1980s, below).

Map 3. Underwater archaeological sites in the Philippines

In 1969 limited archaeological excavations of the shell middens at the Balobok Rockshelter, Sanga Sanga, Tawi Tawi Province in the southern Philippines were undertaken by Alexander Spoehr of the University of Pittsburgh (Spoehr 1973). Recovered at this site were polished shell adzes made from the giant clam Tridacna gigas and red-slipped earthenware shards with impressed