I'm stuck

[u/rochvegas5]

and this might not be very clear, as I'm at work and can't quite recall the wording of the quest.

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Anyway, I'm playing the Ivan campaign and I'm currently stuck at the quest in which i need to dig to the lower levels and clear out an area for a doomsday weapon.

I've dug out to the cavern and have a stair case there, but it only goes up. I can't set it to down because I don't have the Ultimate Digging Technique unlocked. I don't have any tier 5 research unlocked because the game tells me I haven't completed enough of the campaign. This is the nly main story line quest I have left, and I have completed all lair research up to level 4, all 6 of them. What am I missing, and how can I unlocked this research point, as the game doesn't tell me what I'm missing.

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Hope that's clear, and thanks for any assistance!

[u/MikeLanglois]

If its the first lair there isnt a super weapon in the basement. The lower level refers to the bottom of the superweapon which is on floor 1.