Floating storing unit for liquid cargo, such as oil, condensate etc. The storing unit should during normal operations, be unmanned, and is moored in a free, rotatable way relative to a cargo transferring construction mounted close to the bow of the unit. The unit comprises an elongated hull having narrow centre tanks stretching in the longitudinal direction of the unit and side tanks extending on each side of the centre tanks, and being self-draining toward the centre tank. The centre tank is drained toward cargo transferring pumps in the forward and/or aftward end of each centre tank. At the stern of the unit loading/unloading equipment is mounted. The centre and side tanks are filled with gas and liquid so that the volatile liquids in a small extent liberate gases into the atmosphere.
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