Torpedo control

[p7p8]

If you play RA:

Changing Search Depth: The player can change depth of search during work of a torpedo.
For change of depth follow by the following steps:
Switch off sensor controls on a torpedo - pressing of the PREENABLE button.
Then execute the following combination of pressing of buttons:
ENABLE-PREENABLE-ENABLE.
(It is necessary to notice, that the combination ENABLE-PREENABLE-ENABLE works quickly
- 5 seconds allocated for this - Last pressing of the ENABLE button should be not later than 5
seconds from the initially pressed ENABLE button.)
Visually it can be checked on the display - by pressing the ENABLE button a cone of a torpedo
becomes red color, then by pressing the PREENABLE button - the color of a cone becomes dark
blue, and subsequent pressing ENABLE - cone to become of red color - torpedo will do change
of depth of search.
If there is thermal layer and the torpedo is above than layer, then it will change depth of search
so that it was UNDER layer. And on the contrary.
If there is no layer, then the torpedo simply will change depth of search on large or smaller -
depending on what depth the torpedo is.
The torpedo remembers the depth on which the option of search depth change was given.
After preenable sensor controls the torpedo will restore the previous depth of search again.

(from RA weapon guide)

[Polak2]

I guess the answer was right in the manual ....nice.