Drain is a program that runs in MS-DOS platform. It's not dangerous but produces loud sound.
Drain clears the screen at the first. After clicking "Enter" button, it shows some text :
*** SYSTEM ERROR *** Water has been detected in drive C. Drive cleanup in progress. This will take a few moments. Drain phase beginning . . . Drain phase complete. Spin dry phase beginning . . . Spin dry phase complete. Drive cleanup complete. You may continue your work.
After that, you can continue controlling the PC.