1 source checked for this shloka
अस्मात् from this, बिलात् cave, हंसाः swans, सारसैः सह with sarasas, क्रौञ्चाश्च and kraunchas, जलार्द्राः drenched in water, चक्रवाकाश्च chakravakas also, सर्वशः all over, निष्पतन्ति स्म emerging, अत्र here, सलिलवान् abundant water, कूपो वा well or, यदि वा so also, ह्रदः a pond, नूनम् surely, तथा like that, इमे these, बिलद्वारि at the entrance of the cave, पादपाः trees, स्निग्धाः shining, तिष्ठन्ति are present.
'From this cave have emerged several birds like sarasas, swans, kraunchas and chakravakas drenched in water. Surely there must be a source of plenty of water or well or a pond. Moreover there are shining( green) trees at the entrance of the cave (suggesting subsoil water).'