This 2018 study describes findings on the inner ear and cognitive
   injuries sustained by the original 25
   complainees: [1]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: [2]https://web.archive.org/web/20200123232129/http://med.miami
   .edu/news/dr-michael-hoffer-presents-havana-embassy-findings/

References

   1. https://onlinelibrary.wiley.com/doi/10.1002/lio2.231
   2. https://web.archive.org/web/20200123232129/http://med.miami.edu/news/dr-michael-hoffer-presents-havana-embassy-findings/