shown for the low pressure shaft 2 for cooling and lubrication the bearing chamber 5 so formed is continuously supplied with coolant lubricant oil in order to seal the low pressure zone in the bearing chamber 5 against the relatively hot high pressure zone 6 to avoid coking and ignition of the oil the two preferably co rotating shafts here the high pressure shaft 1 and the low pressure shaft 2 are sealed against each other by means of a hydraulic sealing arrangement the hydraulic sealing arrangement comprises an u shaped annulus 8 provided on the high pressure shaft 1 and open to the rotational axis 7 which as a result of the centrifugal forces effected by the rotation of the high pressure shaft 1 is filled with coolant lubricant supplied to the bearing chamber 5 and a circumferential sealing fin 9 on the outer circumference of the low pressure shaft 2 which protrudes into the annulus 8 and the sealing medium 10 present in the annulus 8 during rotation of the high pressure shaft 1 thus sealing the low pressure shaft 2 against the high pressure shaft 1 or the low pressure zone in the bearing chamber 5 against the high pressure zone 6 respectively the u shaped annulus 8 is formed by a first.