The term 'Disease Divers' refers to individuals who use scuba diving and snorkeling to study the effects of diseases on marine life. The two crossword solutions, LOONS (5 letters) and WETSUITS (8 letters), are related to this activity. LOONS are a type of aquatic bird that can be found near bodies of water, while WETSUITS are specialized garments worn by divers to protect them from the cold temperatures of the water. Disease Divers use these items to observe and document the effects of diseases on marine life.