The Project Loon programme was first tested in 2013 in New Zealand using thirty 12m-tall solar-powered balloons designed to reach the stratosphere.
They are designed to travel at speeds between 8 and 30km/h and are guided by software algorithms to move up and down the stratospheric layers to control their direction.
They contain equipment that broadcasts 3G-like wireless speeds to ground-based antennas, which spreads the signal further to users.
About 250 million people live in Indonesia, which is composed of about 17,000 islands, although only 42 million have internet access, according to the CIA's estimates.
The project is primarily funded by money that Google makes from digital advertising, although it was recently assigned to an independent lab called X that is run by Google's new parent company, Alphabet.
Alphabet hopes that Project Loon will be able to bring around 100 million currently unconnected users internet...