Sonar
@p.j.m.
Thanks, noticed that image in a previous post a few days ago. Poor image for current technology. With the many assets (navy and survey ships) on site, much more detailed and sharper images should be available.
During an interview on tv, this morning, an officer on a US navy vessel in the Java Sea said that their equipment was capable to spot a target the size of a tennis ball on the seafloor.....