Walt crawls under the house to find the money is gone. The Reveal: Skyler confesses she gave the money to Ted.
Walt realizes Gus is moving to kill Hank. He rushes home to get the "disappearer" money to take his family into hiding.
In the crawl space, the deep blacks of the Blu-ray master make the final shot look significantly more claustrophobic than the broadcast version. If you'd like to dive deeper, I can help you with:
This episode directly leads into the Season 4 finale, "Face Off," setting the stage for the poisoning of Brock and the assassination of Gus. 💿 Technical Note: Blu-ray 1080p
Marie calls Skyler to tell her the DEA (via Gus's tip) is protecting Hank. This irony saves Hank but traps Walt.
If you are watching the version, pay close attention to:
Skyler gives Ted $621,000 of Walt's drug money to pay his back taxes.