A mobile offshore drilling unit is on the waters of the U.S. Outer Continental Shelf. It has a length of 220 feet and a breadth of 190 feet. Where must the obstruction lights be located?

Correct Answer: Option D — On each corner of the rig

Outer Continental Shelf safety regulations mandate that on MODUs with structural dimensions exceeding specific thresholds, such as 220 by 190 feet, obstruction lights must be positioned on each outer corner of the rig to delineate the total hazard perimeter.