- Create a small location (half of a 1x1 normal grid square; you'll need scmdraft or starforge to do that) and use it for centering on the unit you want to check that is burrowed (has to be a "unique" unit, or else the only one inside its own location). Use an 'always' trigger with 'preserve' to do this.
- Move another 'solid' unit to that location, like a civ or something (no buildings, powerups, or air units though.)
- Make two triggers: One that activates if the solid unit is moved into that location, and one that isn't.
- If the solid unit didn't get moved to that location, then the unit was probably not burrowed and thus the solid unit got moved either right next to it or not at all.
- If the solid unit IS in the location, then do whatever it is your trying to do, as the unit is now burrowed.
- Either case, move the 'solid' unit back to it's storage location in any other trigger after the 'burrowed or not' triggers have activated.
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Thankyou very much. There's über skill at its finest!