Eighteen centuries apart, the identical engineering claim: the primal record was written on media deliberately hardened against the same two named destroyers, water and fire — and both authors insist the artifact is still physically extant and inspectable ('remains... to this day' / 'before the writer's eye'). The preservation claim always comes with a present-tense custody claim.
Against Adam's prediction of destruction 'at one time by the force of fire, and at another time by the violence and quantity of water,' the Sethites inscribe their astronomy on TWO pillars, 'the one of brick, the other of stone,' so that if the flood destroys the brick, the stone 'might remain, and exhibit those discoveries to mankind.' 'Now this remains in the land of Siriad to this day.'
'An Archaic Manuscript — a collection of palm leaves made impermeable to water, fire, and air, by some specific unknown process — is before the writer's eye.'
Josephus quotes verified in Whiston translation at CCEL (Ant. 1.2.3); Blavatsky Proem opening sentence verified via sacred-texts/theosociety copies of the 1888 text.
Our fact-checkers corrected the first draft:
The antediluvian record is not handed down · it is FOUND, by a lone discoverer, in a sealed or forbidden place, and transcribed in secrecy.
Hiding is not enough: in both traditions the primal book is assigned a DEATHLESS GUARDIAN · a pair of appointed angels, an eternal serpent · and in both the deposit sits with respect to water (preserved through the flood / sunk beneath the river) rather than destroyed by it.
Two legal codes, Roman and rabbinic, attach the supreme sanction (death of the divulger; forfeiture of eternity) to speaking one specific protecting name aloud · and both institutionalize the silence rather than the name.
In both, the flood is FORESEEN and the total record is deliberately buried in advance of it · a planned deposit with planned retrieval, not accidental survival.