Who is Henri Bosco from The Poetics of Space and what is their importance?

Henri Bosco is a novelist. Bosco writes about ultra-cellars, where connected underground passages enable underground maneuvers to occur. These depths provide a network of passages, cells and padlocked doors for secrets to be thought and dark plots to form. In another of his novels, diabolical schemes give ground to the sudden appearance of an immense body of black, stagnant water.