Valmiki Ramayana 4.45.16

भू तले सागरे वा अपि शैलेषु च वनेषु च ।पातालस्य अपि वा मध्ये न मम आच्छिद्यते गतिः॥

bhū tale sāgare vā api śaileṣu ca vaneṣu ca |pātālasya api vā madhye na mama ācchidyate gatiḥ ||

Our plain-language meaning of this verse is waiting for scholar review.