"Poptopia, Part 3 of 4: A Complete Unknown"
*Chamber feels the squeeze of tabloid scrutiny as the X-Men continue their search for the helpless mutants surviving in the London underground. Will they reach them before the unstoppable genetic cleanser -- Mister Clean -- does? More mysteries behind this sadistic new adversary are revealed in chapter three of "Poptopia!" *Source: marvel.com
Burning Puddle, Carla, Double Helix, Harmony and Hope are tunnel dwelling mutants in London.