The Gher Cap space fleet was engineered to be transparent so that they could see the stars and nebulas as they crossed the vast expanse of space. In all, the Breegan sympathizers designed, engineered, and constructed fifteen ships.

They were giant see-through globes with vegetation floating around. There was a grow light which provided the plants with energy for photosynthesis. These plants sustained themselves with excrement from the Gher Cap.

It was basically an aquaponics setup.

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A Gher Cap scientist even conceived a synthetic fish flakes generator, though the project was not realized for hundreds of years, long after their race left the Breegan solar system in search of new horizons.

Each ship in the fleet also had a water filter, which oxygenated the tank through perpetually self-cleaning filters that they somehow figured out how to make, because they were very smart.

As for me, I am just a historian, but if you want to learn more about the hard engineering facts of it, I encourage you to visit the space engineering wing of the science museum. Tell Morgan I sent you for 15% off admission.