In August 1966, two Brazilian electronics technicians were found dead on a hill overlooking Niteroi, near Rio de Janeiro. They wore formal clothing beneath raincoats, and beside them were unusual handmade lead masks designed to cover the eyes. Police also recovered a notebook containing cryptic instructions, but no clear explanation of what the men had been attempting to do.

This episode examines the documented evidence surrounding the deaths of Miguel Jose Viana and Manoel Pereira da Cruz, their interest in unusual experiments, the mysterious written instructions, and the difficulties investigators faced when determining a cause of death.

Were the lead masks part of an experiment, a spiritual ritual, or simply equipment connected to an idea that ended in tragedy?