Thousands of years ago, the early Lorgans and Gumai lived on Halog in a new symbiosis when the destroyers, the Hazkan, attacked their world. They were powerful and aggressive and wiped out a great part of their two races. They used the synthium of their armored skin to communicate by sending low-frequency signals. This material did not originate from the four sectors and made them almost invincible.
The Gumai discovered an ancient knowledge on the planet Ju, the Book of Knowledge, which enabled them to manufacture powerful cannons, the so-called red weapons. With the help of these weapons, they were able to push back the destroyers and drive them away. It is assumed that this is the reason why the Gumai build their cities underwater.