Kaworu's coffins

Kaworu's Coffins are a set of coffins present on the moon, they first appear after the 6th Angel defeat when Kaworu appears and chats with one of the Seele members.

In Evangelion 3.0 + 1.0, it is revealed that Kaworu is trapped in an endless cycle and is reborn after each death while keeping his memories of his previous lives in one of Evangelion's timelines. During the human instrumentaly, he is shown coming out of one of the coffins and looking at all the others