A subsea power module comprising: a tank having a tank wall provided with an outwardly protruding corrugation , a power device arranged in the tank , a dielectric liquid which fills the tank , for cooling the power device , characterised in that the subsea power module comprises: a pump configured to circulate the dielectric liquid in the tank , wherein the pump has a pump inlet and a pump outlet , a duct (11; 11'; 11") arranged in the corrugation such that a chamber is formed between a tip of the corrugation and the duct (11; 11'; 11"), wherein the duct (11; 11'; 11") has a duct inlet connected to the pump outlet , and wherein the duct (11; 11'; 11") is provided with at least one duct outlet opening into the chamber , and a distancing structure (15; 15") configured to space apart an outer surface of the duct (11; 11'; 11") facing the tank wall and the tank wall in the corrugation , whereby gaps are formed between the duct (11; 11'; 11") and the tank wall in the corrugation , enabling dielectric liquid that has been discharged through the at least one duct outlet into the chamber to be squeezed out from the chamber and the corrugation , and flow towards the pump inlet . a tank having a tank wall provided with an outwardly protruding corrugation , a power device arranged in the tank , a dielectric liquid which fills the tank , for cooling the power device , characterised in that the subsea power module comprises: a pump configured to circulate the dielectric liquid in the tank , wherein the pump has a pump inlet and a pump outlet , a duct (11; 11'; 11") arranged in the corrugation such that a chamber is formed between a tip of the corrugation and the duct (11; 11'; 11"), wherein the duct (11; 11'; 11") has a duct inlet connected to the pump outlet , and wherein the duct (11; 11'; 11") is provided with at least one duct outlet opening into the chamber , and a distancing structure (15; 15") configured to space apart an outer surface of the duct (11; 11'; 11") facing the tank wall and the tank wall in the corrugation , whereby gaps are formed between the duct (11; 11'; 11") and the tank wall in the corrugation , enabling dielectric liquid that has been discharged through the at least one duct outlet into the chamber to be squeezed out from the chamber and the corrugation , and flow towards the pump inlet . a pump configured to circulate the dielectric liquid in the tank , wherein the pump has a pump inlet and a pump outlet , a duct (11; 11'; 11") arranged in the corrugation such that a chamber is formed between a tip of the corrugation and the duct (11; 11'; 11"), wherein the duct (11; 11'; 11") has a duct inlet connected to the pump outlet , and wherein the duct (11; 11'; 11") is provided with at least one duct outlet opening into the chamber , and a distancing structure (15; 15") configured to space apart an outer surface of the duct (11; 11'; 11") facing the tank wall and the tank wall in the corrugation , whereby gaps are formed between the duct (11; 11'; 11") and the tank wall in the corrugation , enabling dielectric liquid that has been discharged through the at least one duct outlet into the chamber to be squeezed out from the chamber and the corrugation , and flow towards the pump inlet . <EOS>