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I made a blimp made of an ordinary balloon and a simple gondola. The gondola can be easily equipped to the tie of a balloon.

It includes

 - a small motor

 - a propeller

 - a microcomputer (Arduino Pro Mini)

 - LEDs

 - an ultrasonic sensor

 - a battery.

The helium-filled blimp goes up by rotating its propeller. When the distance between the ground and itself grows to a certain length, the blimp detects it by the ultrasonic sensor and turn off its motor and LEDs. Then it goes down (by its own weight) and turns on the motor and LEDs when it reaches the ground. There appears a space like darkness in the water with light emitting bubbles going up by flying these blimps repeating the cycle of this motion.

The blimps fly for about 30 mins. 

A Space with 4 Blimps

Gondola

Simple Video (from vimeo)

For further information, please leave comments.

- Instructables: http://www.instructables.com/id/Balloon-2-Blimp/

- "Glowing Balloon Blimps" published on Hack a Day: http://hackaday.com/2014/01/02/glowing-balloon-blimps/