Yes that's right - Floor E from Chambers 1 East to 4 East where it drains down to Z44.
Incline 1 West is dark rectangle of water in front of the crane we looked down upon.
We also shone our lights down the Chamber 34 incline which drops into water below Floor G. (The building in Chamber 35 is the "Queen Mary" caban which we saw from above after crawling through that square hole in the wall at the top of the below the winding gear.)
"The true crimefighter always carries everything he needs in his utility belt, Robin"