A hot gas path component for a gas turbine engine comprising: a tubular wall structure (25; 225; 325; 425; 525; 625), having an upstream end (28; 228), a downstream end (29; 229), an inner surface (30; 230) and an outer surface (31; 231); a plurality of cooling channels (27; 227; 327; 427; 527; 627) extending through the tubular wall structure (25; 225; 325; 425; 525; 625) between the upstream end (28; 228) and the downstream end (29; 229); wherein an inner portion (33; 233; 333; 433; 533; 633) of the tubular wall structure (25; 225; 325; 425; 525; 625), defined between the inner surface (30; 230) and the cooling channels (27; 227; 327; 427; 527; 627), has a first thickness and an outer portion (35; 235; 335; 435; 535; 635) of the tubular wall structure (25; 225; 325; 425; 525; 625), defined between the outer surface (31; 231) and the cooling channels (27; 227; 327; 427; 527; 627), has a second thickness, greater than the first thickness; wherein the cooling channels (27; 227; 327; 427; 527; 627) have a radial height defined by a maximum radial distance across the cooling channels (27; 227; 327; 427; 527; 627) between the inner portion (33; 233; 333; 433; 533; 633) and the outer portion (35; 235; 335; 435; 535; 635) of the tubular wall structure (25; 225; 325; 425; 525; 625) and the radial height of the cooling channels (27; 227; 327; 427; 527; 627) is greater than the first thickness of the inner portion (33; 233; 333; 433; 533; 633) of the tubular wall structure (25; 225; 325; 425; 525; 625); and wherein adjacent cooling channels (27; 227; 327; 427; 527; 627) are separated from one another by diaphragms (37; 237; 337; 437; 537; 637) transverse to the inner portion (33; 233; 333; 433; 533; 633) and to the outer portion (35; 235; 335; 435; 535; 635) of the tubular wall structure (25; 225; 325; 425; 525; 625); characterized in that the diaphragms are discontinuous and are interrupted by indentations. a tubular wall structure (25; 225; 325; 425; 525; 625), having an upstream end (28; 228), a downstream end (29; 229), an inner surface (30; 230) and an outer surface (31; 231); a plurality of cooling channels (27; 227; 327; 427; 527; 627) extending through the tubular wall structure (25; 225; 325; 425; 525; 625) between the upstream end (28; 228) and the downstream end (29; 229); wherein an inner portion (33; 233; 333; 433; 533; 633) of the tubular wall structure (25; 225; 325; 425; 525; 625), defined between the inner surface (30; 230) and the cooling channels (27; 227; 327; 427; 527; 627), has a first thickness and an outer portion (35; 235; 335; 435; 535; 635) of the tubular wall structure (25; 225; 325; 425; 525; 625), defined between the outer surface (31; 231) and the cooling channels (27; 227; 327; 427; 527; 627), has a second thickness, greater than the first thickness; wherein the cooling channels (27; 227; 327; 427; 527; 627) have a radial height defined by a maximum radial distance across the cooling channels (27; 227; 327; 427; 527; 627) between the inner portion (33; 233; 333; 433; 533; 633) and the outer portion (35; 235; 335; 435; 535; 635) of the tubular wall structure (25; 225; 325; 425; 525; 625) and the radial height of the cooling channels (27; 227; 327; 427; 527; 627) is greater than the first thickness of the inner portion (33; 233; 333; 433; 533; 633) of the tubular wall structure (25; 225; 325; 425; 525; 625); and wherein adjacent cooling channels (27; 227; 327; 427; 527; 627) are separated from one another by diaphragms (37; 237; 337; 437; 537; 637) transverse to the inner portion (33; 233; 333; 433; 533; 633) and to the outer portion (35; 235; 335; 435; 535; 635) of the tubular wall structure (25; 225; 325; 425; 525; 625); characterized in that the diaphragms are discontinuous and are interrupted by indentations.