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The results of high-resolution spectral-line observations of dense moleculargas are presented towards the nuclear region of the type 2 Seyfert galaxyNGC1068. MERLIN observations of the 22 GHz H2O maser were made for imaging theknown off-nuclear maser emission at radio jet component located about 0.3"north-east of the radio nucleus in the galaxy. High angular resolution ALMAobservations have spatially resolved the molecular gas emissions of HCN andHCO$^{+}$ in this region. The off-nuclear maser spots are found to nearlyoverlap with a ring-like molecular gas structure and are tracing an evolvingshock-like structure, which appears to be energized by interaction between theradio jet and circumnuclear medium. A dynamic jet-ISM interaction is furthersupported by a systematic shift of the centroid velocities of the off-nuclearmaser features over a period of 35 years. The integrated flux ratios of theHCO$^{+}$ line emission features at component C suggest a kinetic temperatureT$_{k}$ $\gtrsim$ 300K and an H$_2$ density of $\gtrsim$ 10$^6$ cm$^{-3}$,which are conditions where water masers may be formed. The diagnostics of themasering action in this jet-ISM interaction region is exemplary for galaxieshosting off-nuclear H2O maser emission.

Off-nuclear H2O maser and dense molecular gas in NGC1068