Something doesn't add up to me.
It's been said that only 90% of the oceans have been charted or explored.
So how can scientist say we are running out of this or that when they don't know what's this or that in 90% of the rest?
Extrapolating from samples is not in any way a novel discovery.
If I know that Highway 1 starts in San Francisco and ends in LA, I don't have to verify its existence in between before I have sufficient confidence to drive on it.