We will study H2 dynamics in the nanotubular clay imogolite whose structure has an external diameter of ~2.5 nm and an inner diameter of <1 nm. The tube length of synthetic samples is about 500 nm, and the walls are made of curved gibbsite-like sheets with SiOH groups on the inside and AlOH groups on the outside. This clay provides uniform sub-nanometer cylindrical pores which are negatively charged and will provide a quasi 1-dimensional environment for the H2, to contrast with the truly 2-dimensional galleries of the layered clay analogues. We can also exchange the counterions, and here will use Mg2+ and Ca2+. At low temperatures we will study the rotational tunnelling, with particular interest in the ~14.6meV free molecule rotation. The fate of this feature is an exquisite probe of the H2 environment [1], while at higher temperatures we expect the onset of quasi 1-D diffusion motion.