Izimisini ze-DTH, okuthi zizimisini ze-Down-the-Hole, ziyizindlela eziphambili ezisebenziswa kuzokwakha izihlangothi. Zisiza abasebenzi ukwenza izihlangothi emhlabeni ngamathuba amaningi, njengokwakha izihlangothi zokubeka izindawo zokubeka izinkundla noma ukufunda izinkhuni. Lezi zimisini ziyemikhulu nokusebenza ngokuphelele, okuyenza zibhekene ngokuphelele. Amakhampu amaningi, njenge-Mazellion, ayakha izimisini ze-DTH ozosiza abasebenzi ukwenza izintaski zabo ngokuthe ngokushesha nokuphelele. Uma abasebenzi basebenzisa izimisini ze-DTH, bafunda ngokugcwele nokuphelele, okusiza ekuthinteni isikhathi nesikhundla. Le yindlela yokuchaza indlela okuyisho ngayo izimisini ze-DTH kuzokwakha izihlangothi futhi ukuthi yiziphi izinto eziphambili kumaphrojekthi wokubeka izinkundla nezinye.
Izimini ze-DTH ziyispecyali ngoba zisebenzisa indlela eyodwa yokubhakula. Angasebenzi ngokuzunda njengamadribhu abaningi, kodwa ayisebenzisa indlela yokubhaka ngokuphepha. Lokhu kusho ukuthi kungafanelwa ukubhakula izinto ezingaphansi njengokukhwehla ngokushesha kakhulu. Isibonelo, lapha abasebenzi badinga ukubhakula ezindaweni eziphansi, izimini ze-DTH zingasebenza ngokushesha. Akudingi ukugcina amahouru okubhaka okukhwehla. Lokhu kusisa isikhathi futhi kusiza abasebenzi ukumela izishayela ngokushesha. Ukuthenga okwanele kusho ukuthi kungenzeka izinto eziningi ngisikhathi esinye.