Évolution du cratère Batagaika entre 1999 et 2013, Russie
NASA Earth Observatory images
<a rel="nofollow" class="external free" href="https://earthobservatory.nasa.gov/images/90104/batagaika-crater-expands">https://earthobservatory.nasa.gov/images/90104/batagaika-crater-expands</a>