Seadragon followed a shakedown cruise off the east coast and in the Caribbean Sea .
Seadragon returned to New England and , on 23 May 1940 , departed New London , Connecticut , for the Philippine Islands .
Following a shakedown cruise off the east coast and in the Caribbean Sea , Seadragon returned to New England and , on 23 May 1940 , departed New London , Connecticut , for the Philippine Islands .