(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
View of the climbable path:
Strategy Possible as of Patch 1.001.102
https://youtu.be/utFI940QQrQ?t=147
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.
https://youtu.be/_soxMjjxikI
Crossbow + Commando
Still quick and easy. I don't rely on a red stratagem for this one just cause crossbow has a slightly faster rate of fire. Therefore, it's a little easier on the stratagem budget.
Approximate time to clear: 1 minute
https://youtu.be/ob3SAWWUCKQ
Required: Crossbow | Commando | Thermite | Jump Pack
Approximate Time to clear: 40 seconds
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 accomplish the same thing. Taking an armor with the engineering kit passive will get rid of the need for the commando.
https://youtu.be/e31pRbrY40o?t=425
this is an example of a non speedrunners solo clear.