A seal assembly (300; 500; 700) for use in a bearing compartment (230; 430; 630) of a gas turbine engine, the seal assembly (300; 500; 700) comprising: a seal carrier (330; 530; 730); a compliant structure (320; 520; 720) comprising a first end (322; 522; 722) and a second end (324; 524; 724), wherein the first end (322; 522; 722) is coupled to the seal carrier (330; 530; 730); a support structure (310; 510; 710) coupled to the second end (324; 524; 724); a seal coupled to a first carrier contact surface (332; 532; 732) of the seal carrier (330; 530; 730); and a seal plate disposed adjacent to a nose of the seal, wherein the compliant structure (320; 520; 720) applies a mechanical load to the seal to press the seal against the seal plate, wherein the compliant structure (320; 520; 720) is integral with at least one of the seal carrier (330; 530; 730) and the support structure (310; 510; 710), characterised in that: the compliant structure (320; 520; 720), seal carrier (330; 530; 730) and support structure (310; 510; 710) comprise a steel alloy or a titanium alloy, the compliant structure (320; 520; 720) and the at least one of the seal carrier (330; 530; 730) and the support structure (310; 520; 720) are additively manufactured as an integral piece, the seal plate is rotatable about an axis of rotation, and, relative to the axis of rotation, the compliant structure is disposed radially outward of the seal and a portion of the seal carrier, and the portion of the seal carrier is disposed radially between the compliant structure and the seal. a seal carrier (330; 530; 730); a compliant structure (320; 520; 720) comprising a first end (322; 522; 722) and a second end (324; 524; 724), wherein the first end (322; 522; 722) is coupled to the seal carrier (330; 530; 730); a support structure (310; 510; 710) coupled to the second end (324; 524; 724); a seal coupled to a first carrier contact surface (332; 532; 732) of the seal carrier (330; 530; 730); and a seal plate disposed adjacent to a nose of the seal, wherein the compliant structure (320; 520; 720) applies a mechanical load to the seal to press the seal against the seal plate, wherein the compliant structure (320; 520; 720) is integral with at least one of the seal carrier (330; 530; 730) and the support structure (310; 510; 710), characterised in that: the compliant structure (320; 520; 720), seal carrier (330; 530; 730) and support structure (310; 510; 710) comprise a steel alloy or a titanium alloy, the compliant structure (320; 520; 720) and the at least one of the seal carrier (330; 530; 730) and the support structure (310; 520; 720) are additively manufactured as an integral piece, the seal plate is rotatable about an axis of rotation, and, relative to the axis of rotation, the compliant structure is disposed radially outward of the seal and a portion of the seal carrier, and the portion of the seal carrier is disposed radially between the compliant structure and the seal. the compliant structure (320; 520; 720), seal carrier (330; 530; 730) and support structure (310; 510; 710) comprise a steel alloy or a titanium alloy, the compliant structure (320; 520; 720) and the at least one of the seal carrier (330; 530; 730) and the support structure (310; 520; 720) are additively manufactured as an integral piece, the seal plate is rotatable about an axis of rotation, and, relative to the axis of rotation, the compliant structure is disposed radially outward of the seal and a portion of the seal carrier, and the portion of the seal carrier is disposed radially between the compliant structure and the seal.