Legacy Code Name: EZ Climb.
This is the only variant to feature a crane and has the least amount of turrets/no bunker turrets guarding it.
It also has a relatively unguarded path that grants access to the inside without detection.
Visually: Crane, 2 smoke stacks, no bunker turrets.
On the map: Oblong perimeter - same as Bunker Hell and Mordor. Crane (hard to see on the map but possible to identify if you know what you’re looking for).
Likely needs visual identification to confirm the layout is Crane Fortress specifically
Strategy possible as of Patch 1.001.102.
EZ Climb is still pretty easy, even in the new patch.
Just needs a little help from the Eruptor and a red stratagem of your choice.
The clear is pretty reliable, but climbing up the back of the fortress takes a while so it isn't necessarily faster, just a lot easier.
Uses the Exploding Crossbow and the Commando.
Quick and easy.
I don't rely on a red stratagem for this one since the Exploding Crossbow has a slightly faster rate of fire.
Therefore, it's a little easier on the stratagem budget.
Approximate time to clear: 1m
Uses the Exploding Crossbow, the Commando, the Thermite grenades and the Jump Pack.
If you don't have the Jump Pack, you should still be able to use the vantage point shown in the other two methods to clear it.
Taking an armor with the Engineering Kit passive will get rid of the need for the Commando.
Approximate Time to clear: 40s
This is an example of a non speedrunner solo clear.