Eight hundred million years after the Big Bang, and at the heart of a young galaxy a monstrous engine is already throbbing. A black hole with a mass of ten billion suns devours matter so greedily that its radiation should outshine everything around it. But outside, silence. The powerful searchlight is hidden behind a dense veil of gas and cosmic dust — a cosmic fog that lets not a single ray escape. This is exactly the picture of hidden growth that theorists had sketched, and now high-resolution computer simulations confirm that the first quasars spent millions of years in total darkness, gaining mass in a state of heavy obscuration.

The supermassive black hole, operating in a super-Eddington regime, accumulates colossal energy. Its accretion disk, heated to billions of degrees, bombards the surroundings with radiation. But instead of breaking through the veil immediately, the energy builds up to a critical threshold — and then a series of explosions clear channels in the gaseous cocoon. Over two hundred million years, the density of the gas column at the center drops by a factor of a hundred. The engine emerges from the gloom. Arthur Eddington derived the luminosity limit last century, beyond which radiation pressure blows away matter, but here nature went further: it made the hole first choke on its own food, then violently spit out the excess.

Once the channels are open, the quasar's radiation streams outward. Its spectrum is now dominated by the Doppler shift — a sign that matter is not just falling in but is also being expelled at enormous speed. Ultraviolet and X-ray rays slam into the ejected cold clumps and ionize them, causing them to glow in narrow emission lines. Thus a giant nebula in the Hα line is born — a cloud tens of thousands of light-years across, shining like a beacon for an observer on Earth.

It is precisely these nebulae that astronomers search for using spectroscopy with JWST. Their shape, size, and brightness betray a recent 'blowout' — the moment when the black hole first revealed its face. Such objects are living witnesses to the rapid growth of the first supermassive black holes, solving the puzzle of redshift z>6. Moreover, the simulations show that without this frenzied activity, the interstellar medium would have been completely different: calm, without metal-rich clumps, without streamers of cold gas. Galactic evolution as a whole turns out to be tied to the whims of the central monster. The searchlight doesn't just shine — it reshapes its own foggy cocoon. And when its rays reach our telescopes, we see not a featureless point, but a complex watercolor pattern — a self-portrait of a quasar that has broken free from its gas prison.