One thing I realized is that ramming the side wall with a vehicle, there’s a risk there’s another turret behind the wall…
You might also manage to hack the entrance corridor turret with a control laptop before breaking in (mid/late-game thing). Assuming the turret is close enough to the door. I recently learned that the way the turrets and ID cards work is that the turrets are initially there, and when an ID card is used, the turrets get deleted. (I made a bug report recently about roadblock turrets vanishing)
Digging down into a lab might also be a possibility. But I guess there’s a small risk of ending up in front of a turret…
Another break-in technique: You have a vehicle that has an automated turret in the front. Your windshield has curtains. You would then aim the vehicle, close the curtains and ram the front doors. Your vehicle turret should deal with the corridor turret.
A variation of crashing in through the side wall: You would crash in, but you wouldn’t deal with the corridor turret at all. Instead, if you have the ability to destroy walls, you would destroy the walls next to the stairway, and simply run down the stairs before the turret even gets a chance to shoot. Coming back up might be risky though… Depends.
There’s now also Cloaking CBM. It’s probably way more rare than science ID cards, so… But it does effectively render you invisible at a significant power cost, enabling you to run past the turret. If you’d also have the Directional EMP CBM, you could walk next to the turret and fry it, too, but that risks explosion.
Let’s not forget about Sonic Resonator CBM, the go-to wall destroying CBM.
Also, zombie slaves as decoys and bullet magnets for the turret.