A rotor section for a gas turbine engine, the rotor section comprising: a first rotor bore having a first inner radial hub; a bore basket extending axially between a first axial end and a second axial end opposite the first axial end, the bore basket having: an engagement panel disposed at the first axial end; a cylindrical inner radial panel; a cylindrical outer radial panel, wherein the inner radial panel and the outer radial panel extend between the first axial end and the second axial end, and the inner radial panel is disposed radially inside of and separated from the outer radial panel, and an annular passage is disposed between the inner radial panel and the outer radial panel; a plurality of inlet apertures in fluid communication with the annular passage at a first axial position; and a plurality of exit apertures in fluid communication with the annular passage at a second axial position, the second axial position separated from the first axial position; wherein the second axial end of the bore basket is attached to the first inner radial hub of the first rotor bore; characterised in that: the first rotor bore and bore basket are a unitary structure; and the first rotor bore and the bore basket comprise the same material. a first rotor bore having a first inner radial hub; a bore basket extending axially between a first axial end and a second axial end opposite the first axial end, the bore basket having: an engagement panel disposed at the first axial end; a cylindrical inner radial panel; a cylindrical outer radial panel, wherein the inner radial panel and the outer radial panel extend between the first axial end and the second axial end, and the inner radial panel is disposed radially inside of and separated from the outer radial panel, and an annular passage is disposed between the inner radial panel and the outer radial panel; a plurality of inlet apertures in fluid communication with the annular passage at a first axial position; and a plurality of exit apertures in fluid communication with the annular passage at a second axial position, the second axial position separated from the first axial position; an engagement panel disposed at the first axial end; a cylindrical inner radial panel; a cylindrical outer radial panel, wherein the inner radial panel and the outer radial panel extend between the first axial end and the second axial end, and the inner radial panel is disposed radially inside of and separated from the outer radial panel, and an annular passage is disposed between the inner radial panel and the outer radial panel; a plurality of inlet apertures in fluid communication with the annular passage at a first axial position; and a plurality of exit apertures in fluid communication with the annular passage at a second axial position, the second axial position separated from the first axial position; wherein the second axial end of the bore basket is attached to the first inner radial hub of the first rotor bore; characterised in that: the first rotor bore and bore basket are a unitary structure; and the first rotor bore and the bore basket comprise the same material. the first rotor bore and bore basket are a unitary structure; and the first rotor bore and the bore basket comprise the same material.