Tell six subjects to swim in the ocean naked

A part of the ship sat partially submerged in the water, making embarment and close observation of the aquatic wildlife convenient.

The captain orders six subjects, three male and three female, to go to one of the access doors open to the water.

"Remove your clothes and step into the water, its perfectly safe." He says over the intercom.

Selected for their gullibility and trust in authority the subjects comply and strip off their space suits, their naked bodies entering the alien ocean as a multitude of camera drones and sensors are released onto the water, closely monitering their every move.