Harbor of Refuge Breakwater (Outer Wall)

The mile-and-a-half-long outer breakwater off Cape Henlopen, built of more than a million tons of granite in the early 1900s to shelter the mouth of Delaware Bay. The submerged rock slope is heavily encrusted with mussels and attracts tautog, sheepshead, striped bass and record-class black drum, making it the region's storied freediving and scuba spearfishing site; the Gypsum Prince wreck lies at its seaward end. Depths along the wall run from the surface rocks down to about 40-70 ft on the surrounding bottom, with strong tidal flow around the structure.