What is happening with that glider?
the engine is damaged
it is releasing the water ballast
cabin decompression is ongoing
contrails are formed due to low air temperature
The extra weight provided by the water ballast is advantageous if the lift is likely to be strong, and may also be used to adjust the glider's center of mass. To avoid undue stress on the airframe, gliders must jettison any water ballast before landing.
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Answers by country
the engine is damaged
it is releasing the water ballast
cabin decompression is ongoing
contrails are formed due to low air temperature
answers
Australia75
New Zealand17
Germany382
Unknown13
the Netherlands17
Austria59
Switzerland39
Greece15
France13
the Philippines25
Canada39
Poland8151
the United Kingdom209
the United States435
Republic of Ireland27
Malaysia19
Spain16
South Africa19
India194
Singapore18