Flood it.
That's been discussed on this board before. A loch gate that opens up to the Potomac. Open it. Wash all that evil away.
Anon has seen lots of flood damage. There is no fixing it. There is only ripping it out and rebuilding. Burn it or flood it but it needs to be permanently put out of service.
How do we know those security cam pics we thought were of Epstein Island weren't actually tunnels under the Capitol?