There happened something above the field, what is possible (force effects) to compare with an explosion of hundreds, in extreme cases even many thousands of kilograms of TNT at a small height above. Incidentally, after the explosion of explosives anywhere in the world, just above ground or near below is always and only created circular crater... (as well as after the impact of any object in the water are created solely and only circular waves on the surface).
Kuna kitu kilichotokea juu ya shamba, ni nini yanayoweza (nguvu madhara) kulinganisha na mlipuko wa mamia, katika kesi kubwa hata wengi Maelfu ya kilo ya TNT katika urefu ndogo hapo juu. Kutokea, baada ya mlipuko wa mabomu mahali popote duniani, tu juu ya ardhi karibu au chini ni daima na aliumba tu volkeno mviringo... (Kama vile baada ya madhara ya yeyote kitu katika maji ni umba tu na tu mawimbi mviringo juu ya uso).