"Like a Battleship, but with much less floating. Which means it’s even less likely to sink!"
Fortresses are a tier 8 Bullets industry. The price is 
100 AA Battleships, 
100 JJJ Bullets, and 
4 Comrades. Fortresses are quite a bit harder to reach and purchase than previous industries. The Battleships cost in particular will require level 2 Mega Tron and Level 5 Megacop (or equivalent - x10 M discount) to feasibly afford.
The first mission requiring fortresses is on 
Rank 75. Automating this industry requires Dominics Angels, who unlock at 
Rank 76.
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