Related Clues:

• Arctic Ocean floater
• Cold chunk
• Unsinkable ice sheet
• It's mostly underwater
• It's frozen and floating
• A floating mountain
• Huge mass of frozen water
• Maritime danger, mostly underwater
• A field of floating ice
• Large mass of floating water
• Large floating mass of frozen water
• Floating mountain
• A large lump of floating ice
• A floating ice mountain
• A floating lump of ice