Floating vessel with moon well and ice guard therefor

In a floating vessel having a hull and an opening through the bottom of the hull, the opening through the bottom of the hull being bounded by upright side walls of the hull;

• the improvement comprising an openwork fence structure for the purpose of preventing ice from entering said opening, said fence structure disposed in said opening and guided by the side walls of the opening for vertical movement between a raised position in which the fence structure does not extend below the bottom of the hull and a lowered position in which the fence structure extends both above and below the bottom of the hull, said fence structure being comprised by vertical rods, the fence structure having a plurality of sides as seen from above, there being a plurality of said vertical rods intermediate the ends of each side of the fence structure, said vertical rods forming a pair of vertical side walls that extend lengthwise of the vessel, the space between these side walls being open and unimpeded as seen from above, so as to allow further structure to be independently raised and lowered through the unimpeded space.