Abstract: The present invention relates to a tanker vessel for the transportation of oil or other liquids, which present a danger to the environment: the tanker vessel consists of a hull with a bottom (10), two sides (12, 14), an upper deck (16), at least two longitudinal bulkheads (18) and a number of transverse bulkheads, which together form a number of center tanks (28) and side tanks (24, 26), wherein a mainly horizontal between deck (22), located considerably below the load water line of the ship, divides at least the side tanks into upper and lower compartments (24, 26). In order to eliminate or reduce the risk of oil spills caused by collision damages in the side, according to the present invention, the upper side tanks (26) are ballast tanks, while the lower side tanks (24) are cargo oil tanks, which at the head are connected to vertical oil riser trunks (30), which via branch (36) with a non-return valve, are connected to an oil reception tank.