Riptide Laboratory

Publisher's blurb: A pitch-black whirlpool churns and gurgles like a greedy beast at the centre of this laboratory, surrounded by stone platforms and eight pillars. Metal grids criss-cross the network of walkways, with steps leading out of the dark cavern and into a series of rooms which lead to the entrance. Blue lights glow on cold, stone walls within those chambers. They are filled with pools or containment cylinders of blue liquid—but what are they for? And why does the carved face of some tentacled being look over them?