What are some secret places here?

Hint 1 of 13:

There are only two secret places, and both involve finding the Control Room
of the Enterprise.

Hint 2 of 13:

(1) Near the end of the level, go up the escalators.

Hint 3 of 13:

In that big, central section, you'll find the entrance in there.

Hint 4 of 13:

Look for a hidden switch.

Hint 5 of 13:

Not too far away from the First-Aid compartment, there's a door that will
open to reveal an alcove.

Hint 6 of 13:

Inside is some steroids and a switch.

Hint 7 of 13:

If you hit that switch, a wall will lower on the other side of the big room.

Hint 8 of 13:

The object is to hit the switch, and run to the newly-opened wall.