fort in red

[Hanzberger]

Not sure what this represents when the fort is in red.

[GetAssista]

It means your current engineers/supplies on base are not enough to continue building forts higher than current level. Not sure about exact thresholds though

[BBfanboy]

Up to level 6 forts you need normal supply at the base. IIRC, at level 6 the supply requirement doubles, and doubles again for each level after. You are pouring a lot of concrete at that stage!

[Trugrit]

+1

Alfred is a very reliable source of information:

fb.asp?m=2764119

“Not all bases can build up their fortification level beyond 6.
The base screen will indicate whether you can build beyond level 6.
You will not be able to build up your tiny atoll beyond level 6.
Furthermore, where you can build beyond level 6, you need to have 25k+ in supplies present.

If the supply depot drops below 25K, the base construction figure will appear in red and construction
will freeze until the supply again exceeds 25k.”

[Hanzberger]

Ok thanks