Martinstein has a hotel with a restaurant and a ninepin alley. One must rent a boat in order to reach the Ninepin Group. Numerous inclined columnar jointed volcanic rocks create cliffs and coastal scenery around the Ninepin Group. Columns in the Ninepin Group are as large as 3-meters in diameter. Because no one lives on Ninepin Group, there is no public transportation to the islands. In some cases, the member represents only the Tenpin discipline or the Ninepin discipline. See World Ninepin Bowling Association members for partial list, "till updated here". For a long time, the Ninepin Group was devoid of human presence. The Mirs Bay ferry ("Albatross") sank near the Ninepin islands, with 120 passengers dead. The Ninepin Group falls under the jurisdiction of Sai Kung District of Hong Kong.