To migrate from the Star Alliance Arrivals Lounge to the LHR Hilton, we first took the Heathrow Express, which offers a free ride to Terminal 4.
Once there, we took a lift up to the departure level and found the adjacent entrance to the Hilton's tube, a covered walkway that leads to the hotel.
We then went tubing.
And we kept on tubing, meeting nobody along the way but a solitary employee somewhere near the middle mopping the floor - that must be a full-time job.
Finally we emerged from the tube - about six minutes later as the sign at the entrance touted - to the great outdoors and a quick breath of fresh air before entering the hotel.
Our room is on the top floor, and the gangway-like open corridors from the lifts to the room hallways on each side offer a good view of the main floor in both directions.
We'll visit the Executive Lounge on the ground floor later, but now it's nap time.