We’ve now published the technical reports. Broadly, it covers electrochemical replications of all previous notable experiments, more than 200,000 sample-hours of calorimetry across much wider parameter space, and custom hydrogen-compatible hardware operating at pressures up to 600,000 psi with a wide range of stimulation applied to the material. No evidence of cold fusion was found in the conditions investigated. The landing page provides a summary. The details are in the (quite large) reports of both the electrochemical and ultra pressure reports.
Given the general interest in energy technology here on HN I figured it was appropriate to post.
I was Head of Engineering at Project Callisto during its early years. I left after a set of experiments that I considered definitive returned a null result. The program continued on for several years, exploring a much larger set of conditions. It was a wild ride!