Arthashastra
जटिल व्यञ्जनम् अन्तर् उदक वासिनं वा सर्व श्वेतं तट सुरुङ्गा भूमि गृह अपसरणं वरुणं नाग राजं वा सत्त्रिणः क्रम अभिनीतं राज्ञः कथयेयुः ॥
Any person, disguised as an ascetic and living under water or in the interior of an idol entered into through a tunnel or an underground chamber, may be said by his disciples to be Varuna, the god of water, or the king of snakes, and shown to the king.
english translation
jaTila vyaJjanam antar udaka vAsinaM vA sarva zvetaM taTa suruGgA bhUmi gRha apasaraNaM varuNaM nAga rAjaM vA sattriNaH krama abhinItaM rAjJaH kathayeyuH ॥
hk transliteration by Sanscript