Yellow “hard hats” encase glass flotation spheres that top the infrastructure on the Deep Profiler Moorings. These spheres were being installed from the fantail of the R/V Thompson as part of the Slope Base Mooring during Leg 2 of the NSF-OOI-UW Cabled Array VISIONS'15 crusie. Credit: Mitch Elend, University of Washington. V15.