Water boils at 100°C. In the view below, the water is initially at around 60°C.
How is this possible?
At sea level, where the pressure is atmospheric pressure (approx 105 000 Pa), the boiling point of water is 100°C.
In the video as air is sucked from the sealed container, the pressure in the container decreases. This lowers the boiling point of the water to around 60°C, hence water will boil and bubbles are formed.
It is similar to boiling water at high altitude, like on top of Mount Everest (about 8 km high). Water will boil around 70°C to to lower atmospheric pressure at high altitude.