We see here the super dreadnought Szent Katalin,built in desperation by the Secessionists from the hulk of the HMS Phobos and an incomplete hull of the same class. These were both captured with the equatorial dockyards at Mons Daktylus. These hulls were mated crudely, with the lower one serving to house a repurposed 200 cm orbital defense cannon. The gravity drive is aligned in such a manner as to absorb the recoil with the power of the drive itself. One of the eerie characteristics of the Dream Plague was the gradual recovery of the knowledge of the Grey Martians via hallucinations and automatic writing. What started as a neurosis became a cult, then a mass panic, and finally evidence that a long dead race was reasserting itself through unknown means.
The Phobos was destroyed, with the rest of the Neomartian fleet, in a desperate bid to reach Earth. Our home, once having been saved by the power of the invisible world, was almost destroyed by it in this instance.