The cool thing about Hinduism and the Vedas is that it didn't get the whole "be christian or die" treatment the Western traditions did, at least until relatively recently. It still degraded through the Age of Pisces=Kali Yuga but survived in a manner that can at least be somewhat decoded and they did leave the Vedas intact. It's funny because that led to a whole "everything is from India" movement but they say they got the knowledge form the West. Everyone got it from somewhere that is currently underwater would be my guess and there's plenty of deep water archaeology to support that.