Natyashastra
उत्तानाधोमुखौ कार्यावग्रे वक्त्रस्य संस्थितौ । वडवानलसङ्ग्राममकराणां च दर्शने ॥ ३६॥
Two Tripatāka hands, one facing upwards and the other downwards, placed in front of the face, should be used to represent submarine fire, battle, and sea-monsters.
english translation
uttAnAdhomukhau kAryAvagre vaktrasya saMsthitau । vaDavAnalasaGgrAmamakarANAM ca darzane ॥ 36॥
hk transliteration by Sanscript