In really rare cases, discharge may cause an underground explosion of real equivalent several hundred kilograms of TNT, when during the travel underground meets with unexploded, even if considerably dilapidated and considerably staggered, several hundred kilogram bomb from World War II. (craters in the fields).
Sa talagang bihirang mga kaso, naglalabas maaaring maging sanhi ng isang underground na pagsabog ng mga tunay na katumbas Maraming daang kilo ng TNT, Kapag panahon ng paglalakbay underground nakakatugon may unexploded, kahit na malaki wasak-wasak at marami staggered, Maraming daang kilo bomba mula sa World War II. (Craters sa mga patlang).