A Fissure is the result of experimenting with science beyond your ability.
A Fissure contains antimatter, and thus cannot be demolished by normal means. The only known way is to pile up tonnes of ore, push them into the Fissure, then the antimatter can be neutralised. Out of the combinition of protons, neutron and electrons between them, two of them are known in the Expanse:-
Note that these are real antimatter properties tested.
Upon any neutralising it will require a usually huge amount of ore, proportional to your Fissure level, and then the Fissure will downgrade. A fissure can only be downgraded, one level at a time, until level one when it can finally be demolished completely.
Early reports from empires that have been affected by the Cosmic String show that as the energy ribbon passes all Black Hole Generators are converted into a Fissure of the same level.
Careful experiments indicate that at a certain level and circumstances a Fissure may attract surronding antimatter floating in space, thus become more unstable and possibly spawn 'daughter' Fissures. After the passing of the Cosmic String the Lacuna Expanse Corp updated all universities with the knowledge of how to create Fissure Containment Systems. This ensures that all new Fissures are contained as soon as they are formed. It is imperative that you closely monitor Fissures and if the Containment Equipment falls below 100% you should repair it immediately.
During the last galactic census, there were no reports of any colony having more than one Black Hole Generator. This is good news since, although the science is rather tricky, it is thought that having two Fissures on a single planet is a bad thing and having three is awful.
Lv 30 to Lv 29 15.1B ore
Lv 29 to Lv 28 8.6B ore
Lv 28 to Lv 27 4.9B ore
Lv27 to Lv 26 2.8B ore
Lv 26 to Lv 25 1.6B ore