Sealing system for underwater turbine

A sealing system for sealing a rotatable shaft of an underwater turbine against an entry of seawater, comprising:

• a first seal support and a second seal support arranged axially adjacent to the first seal support along the shaft,
• a first seal element supported by the first seal support and a second seal element supported by the second seal support, the first and second seal elements each comprising an annular seal body and a lip extending from the seal body to a sealing surface on or rotationally fixed to the rotatable shaft, and
• at least one lubricant-filled chamber between the first and/or second seal supports and the shaft,
• wherein each of the first and second seal supports includes, at a radially outer region of the respective one of the seal supports, a plurality of circumferentially spaced boreholes, and
• wherein an outer diameter of the first seal support is greater than an outer diameter of the second seal support such that the boreholes of the first seal support are not covered by the second seal support.