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The disease can produce severe maternal anemia, iron deficiency, or it can spread to the kidneys and the lungs and cause a condition known as blackwater fever.

The deaths are believed to have been caused by hypoxic blackwater, a naturally occurring phenomenon which causes extremely low oxygen levels.

The campus has an on-site blackwater treatment center to recycle water so that it can be used for irrigation and the building’s toilets.

“One evening a marine biologist took us on a blackwater dive,” Nielsen said.

In blackwater diving, however, powerful underwater lights are attached to a tether to illuminate the water, often attracting animals, including sharks.