naruto - Why were the coffins of First and Second Hokage not sealed? - Anime & Manga Stack Exchange

In Naruto, we have seen that Orochimaru summons the coffins of both, the 1st and 2nd Hokage, and uses them to fight against the 3rd Hokage. Also in Shippuden Season 2, he tells that he experimented

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naruto - Why were the coffins of First and Second Hokage not sealed? - Anime & Manga Stack Exchange

Naruto 489 Breakdown: 'Cause this is thriilleeer! Thriiilleer night! Demotivational poster, WRA comic and official debate inclusive. Just click me…you know you want to…@__@