Don't continue until you have real tea, not merely Advanced Tea Substitute.
Have you ever examined the cup of tea?
Tea is a better source of Brownian Motion for the Improbability Drive than the Advanced Tea Substitute (ATS). Try it.
Notice anything different about Dark when you use tea instead of ATS?
For one thing, a sense is missing right away, rather than
after three WAITs.
More importantly, with tea, a different sense will be missing
each time you WAIT. Thus, you can "control Dark."
There are eight exits from Dark (taste never goes away), so
there are two Dark exits for each missing sense.
There is a way to differentiate between each pair.
For example, when smell disappears, type SMELL DARK. If the object is "being waved," then the exit leads to the Vogon Hold. If the object is "waving," the exit is the Lair of the Ravenous Bugblatter Beast of Traal.
When hearing is missing: If the sound is "far above you," then your exit is Entry Bay Number Two of the Heart of Gold. If it's "far below you," then it's the War Chamber of the battle fleet.
If seeing is the missing sense: When the light stabs at the
"front" of your eyes, then your exit is the Country Lane. When it's at the "back" of your eyes, then you go onto the Presidential Speedboat.
When feel is missing: If it feels "cold" and wet and squishy,
the exit is to the Living Room party. When it's "warm," your exit is into the sperm whale.
When you are controlling dark and have determined your current exit, but you don't want to go there, simply WAIT and you will get a new missing sense. NOTE: You will never get the whale exit unless you are using real tea for your Brownian Motion source.
