A family of space-filing tetrahedra fill this triangular prism (as well as those next to it). Another vZome by David Koski based on research by Michael Goldberg and others.
This family is in addition to the four space-filling tetrahedra cataloged by D.M.Y. Sommerville in 1923: the Mite, Rite, Bite and 1/4 Rite (using Bucky Fuller's nomenclature).
Dr. John Belt, SUNY, Oswego