चतुरश्रां वापीमन्नुदकोपस्नेहां खानयित्वा पृथुशिलाभिरुभयतः पार्श्वं मूलं च प्रचित्य सारदारुपञ्जरं भूमिसमं त्रितलमनेकविधानं कुट्टिमदेशस्थानतलमेकद्वारं यन्त्रयुक्तसोपानं भूमिगृहं कारयेत् ॥ कZ_०२.५.०२ ॥
caturaśrāṃ vāpīm annudakopasnehāṃ khānayitvā pṛthuśilābhir ubhayataḥ pārśvaṃ mūlaṃ ca pracitya sāradārupañjaraṃ bhūmisamaṃ tritalam anekavidhānaṃ kuṭṭimadeśasthānatalam ekadvāraṃ yantrayuktasopānaṃ bhūmigṛhaṃ kārayet
He should construct an underground chamber by excavating a square pit that is not prone to water seepage; lining the sides and base on both sides with broad stone slabs; fitting a strong timber-cage framework; making it level with the ground; providing three tiers and multiple compartments; laying paved floors at the various levels; keeping a single entrance; and installing stair-access with mechanical devices.
Strict access control: minimizing entry points reduces unauthorized access, simplifies guarding, and strengthens auditability of movements.
To protect stored wealth from environmental loss (water damage) and from structural vulnerabilities that could enable covert entry.