A gas turbine having a seal sealing a trench cavity defined between a stator inboard face and rotor inboard face. The seal may include a stator overhang that extends axially toward the rotor inboard face. The stator overhang may include an overhang topside, an overhang underside, and an overhang face that is defined therebetween. The trench cavity seal may include a platform lip extending axially from the rotor inboard face toward the stator inboard face and circumferentially spaced turbulators extending axially from the rotor inboard face. An outboard edge and an inboard edge of the stator overhang axially jut such that, therebetween, a recessed pocket on the overhang face is formed. The platform lip may radially overlaps the recessed pocket on the overhang face so to form a multiple switch-back flowpath.