is the brand name for the products of Heesen Shipyards, located in Oss, the Netherlands. Heesen Shipyards carries the distinction of being the first Dutch builder to construct aluminum hulls for yachts. A Diaship yacht was the premier megayacht to surpass 50 knots in speed, and Diaship has the worldwide reputation of building the four fastest megayachts. Unique designs, combined with high technology and traditional crafting, characterize the Diaship yacht fleet. From 115 feet to 213 feet in overall length, in displacement, semi-displacement, and performance styles, Diaship custom yachts exhibit fitness for sea voyages and elegance. The Superyacht Society awarded the Heesen/Diaship yacht, Alumerica, “Best Power Yacht” in the 105 feet to 141 feet category.