Blake & Mortimer - Volume 17 - The Secret of the Sworfish (Part 3)

The captain and the professor have finally made it to the secret base with the
Swordfish blueprints, and construction has begun on the extraordinary
machines. Olrik hasn’t had his last word, though, and he is ready to take
tremendous risks to locate the world’s last bastion of resistance and freedom.
A race against time is on between Imperial forces on one side and Mortimer’s
teams of engineers on the other... The fate of civilisation is at stake.