This 2018 study describes findings on the inner ear and cognitive injuries sustained by the original 25 complainees: https://onlinelibrary.wiley.com/doi/10.1002/lio2.231

Their experience was eerie in that pressure and sound seemed to mysteriously follow them within specific bounds.

Here's another article: https://web.archive.org/web/20200123232129/http://med.miami.edu/news/dr-michael-hoffer-presents-havana-embassy-findings/