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
New Zealand
17
Australia
74
Germany
364
Greece
13
Unknown
13
Austria
58
the Netherlands
17
the Philippines
25
Canada
39
Poland
8089
the United Kingdom
204
Switzerland
36
the United States
426
Republic of Ireland
27
Malaysia
19
Spain
16
South Africa
19
India
193
Singapore
18
Nigeria
13