Do you think they built the Sarcophagus to bury the fourth block?
No. They built it so the fourth block wouldn't bury everything around it.
After the first incident, there was nothing left to repair there. Over 206 days, an entire mountain of concrete and metal was raised over the destroyed reactor — 345 thousand cubic meters of concrete and 7 thousand tons of metal structures. They were assembled at a distance, because it was impossible to stand nearby.
The Sarcophagus was built from new structures and from what survived of the block itself. From the very beginning it was considered a temporary solution, meant to buy some time and quickly seal off whatever remained inside.
And what remained inside was almost all the fuel, fragments of the reactor core, radioactive dust, and places people couldn't reach for decades. Then the second incident happened — and since then, people speak of the Sarcophagus in a whisper. Because who knows, maybe the Monolith will hear.
Or maybe it's listening right now...
