Micro Prose X-COM-TERROR FROM THE DEEP Manual page 28

Click on the grenade again.
50. The only option is Throw.
Click on Throw.
51. The Battlescape reappears. The cursor has
a throw icon superimposed over the
3-D box.
Click on the location where you want to
throw the grenade.
52. One of three things will happen:
A. The aquanaut will throw the grenade.
B. The message Out of Range! appears. If
this happens, the target location is too far
away — choose a target location closer to
your aquanaut.
TERROR FROM THE DEEP
C. The message Unable to throw here!
appears. This is because an object is
obstructing the throw. If this happens,
choose a different target location.
Don't forget, once you have thrown the
grenade, you've got just three turns to clear
the area!
COMPLETING THE MISSION
53. Continue searching for aliens (go back to
step 33 of this tutorial). When all aliens
have been killed, the mission is over.
X-COM will then automatically recover the
Alien Sub's remains, alien artifacts and alien
corpses.
To abort the mission before the mission
objectives are completed, click on the
button in the Control bar.
Aborting a mission will only save aquanauts
who have returned to the Triton Sub, a
warning message appears if you attempt to
take off without your full squad.
Note: Do not allow the aliens to kill all of your
squad — there will be no one to return the
Triton Sub back to its base, and it will be lost.
If you are down to your last aquanaut, abort
the mission.
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TERROR FROM THE DEEP