Abstract: The invention relates to a vessel or a floating structure operating in ice-covered waters comprising a hull or the like (1, 1?) including at least one bow-like end or a similar hull portion (2, 2?), which is exposed to the loading effect of the ice, while the ice or the vessel is moving. Said bow-like end or a similar hull portion (2, 2?), in the underwater part of the hull, is equipped with means for leading one or several strong, mainly upwards-directed flows of water towards the ice or the ice field encountered by the bow-like end or a similar hull portion (2, 2?). The invention also relates to a method of using the vessel or the floating structure.