Lake Michigan lake bottom and the corner of a pivot point
![Lake Michigan lake bottom and the corner of a pivot point](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/Frame-16-10-2018-01-53-24.jpg?itok=QETfbQnD)
Detailed Description
Lake Michigan lake-bottom near South Manitou Island. Visible is part of a diver's hand and the corner of a anchor point used for circular transects.
Sources/Usage
Public Domain.