At The Mountains Of Madness by I.N.J. Culbard

A scientific Antarctic expedition uncovers the frozen remains of an impossibly ancient alien city and disturbing bas-reliefs that reveal the history of primordial beings and their experiments in creating life. As the team explores, they unearth living, shape-changing remnants of those experiments and gradually piece together a terrifying cosmological history that culminates in violent, otherworldly confrontations. The mission unravels into disaster and desperate flight, and the lone survivor recounts the events as a stark warning against delving into certain buried, primeval mysteries.