Sub-laser cycle time scale of electronic response to strong laser fields enables attosecond dynamical imaging in atoms, molecules and solids 1-4 . Optical tunneling and high harmonic generation 2, 5-7 are the hallmarks of attosecond imaging in optical domain, including imaging of phase transitions in solids 8, 9 . Topological phase transition yields a state of matter intimately linked with electron dynamics, as manifested via the chiral edge currents in topological insulators 10 . Does topological state of matter leave its mark on optical tunnelling 1 arXiv:1806.11232v2 [physics.optics]