Buoyant offshore structure

1. A buoyant offshore structure, comprising

a hull element having an inner space, a surface end and an underwater end, wherein the hull element comprises a sump tank; and

at least one storage tank for liquid, wherein the at least one storage tank is at least partially arranged in the sump tank and extends from the surface end of the hull element into the inner space, wherein the storage tank is removable from the inner space by lifting from the hull element's surface end.

2. The buoyant offshore structure according to claim 1 , comprising a plurality of storage tanks for liquid.

3. The buoyant offshore structure according to claim 1 , wherein a plurality of storage tanks is at least partially arranged in the sump tank.

4. The buoyant offshore structure according to claim 1 , comprising a plurality of sump tanks.

5. The buoyant offshore structure according to claim 1 , wherein the floating offshore structure comprises additional hull elements having an inner space, a surface end and an underwater end.

6. The buoyant offshore structure according to claim 1 , wherein the at least one storage tank is laterally supported between the surface end and the underwater end.

7. The buoyant offshore structure according to claim 1 , comprising a plurality of storage tanks which are laterally supported between the surface end and the underwater end.

8. The buoyant offshore structure according to claim 1 , wherein the at least one storage tank is laterally supported in the sump tank.

9. The buoyant offshore structure according to claim 1 , wherein the at least one storage tank comprises a corrosion-resistant metal at an inner surface.