Identified as submerged atolls on Palawan Bank.Note similarity in shape to salt structures in Gulf of Mexico.See images theb.3833.htm and theb.3834.htm
4/4/2019 12:53:55 PM
Date: 1933
Credit: Association of Commissioned Officers
Location: Palawan Bank, Philippine Islands
Subject: Charting
Subject: Soundings
Subject: Bathymetry
Subject: Acoustic