Thanks to Elad N. Rachmilovitz 

A Niskin bottle is a device for obtaining samples of seawater at a specific depth. A large number of Niskin bottles to be mounted together in a circular frame is termed a rosette.
During our research cruise the rosette was lowered several times. Between 2 meters and 1000 meters in one of the times I secured and lowered a camera (GoPro) with the rosette