
After Archibald Blair's survey of the Andaman and Nicobar Islands in 1789, a settlement was established at present-day Port Blair (then called Port Cornwallis). In 1792 it was shifted to the Northern harbor (present-day Diglipur) which was also christened Port Cornwallis (the former became Old Harbour). But, that settlement was abandoned in 1796 because of the high mortality rate. Between 1789–92, Blair established a hospital and a sanatorium at Netaji Subhas Chandra Bose Island.