What is Ocean glider ........

Explanation:

is an autonomous, unmanned underwater vehicle used for ocean science. Since gliders require little or no human assistance while traveling, these little robots are uniquely suited for collecting data in remote locations, safely and at relatively low cost.
Gliders may be equipped with a wide variety of sensors to monitor temperature, salinity, currents, and other ocean conditions.
This information creates a more complete picture of what is happening in the ocean, as well as trends scientists might not otherwise be able to detect from satellites or large research ships.
Scientists are now experimenting with using gliders to locate populations of spawning fish