STEEL HULLED AND ALUMINIUM HULLED HEESEN SUPERYACHTS - BUT WHY???

Subscribe to Heesen Yachts' YouTube channel at https://www.youtube.com/user/HeesenYachts Heesen are famous for building some of the world's finest aluminium superyachts, and now also for superyachts with steel hulls. But why do they build some from steel and some from aluminium? And how do they join the two metals together. Heesen themselves kindly answer those questions.