Divers prepare oceanographic equipment
![Divers prepare patterns of known targets for verification of sonar resolution.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/az_target.png?itok=pUQEPlz1)
Detailed Description
Divers prepare patterns of known targets for verification of sonar resolution.
Sources/Usage
Public Domain.
Divers prepare patterns of known targets for verification of sonar resolution.
Public Domain.