Soraluzen egin diren tunelek hiru erabilera mota izan dute, historiaren hiru momentu desberdinetan eginak: trenbidearenak, urarenak eta autobidearenak.
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Urte batzuk geroago, 1910 hamarkadan, Txurrukenen parean zegoen trazadura zuzendu zituzten, eta horretarako Arkaitzeko tunela zabaldu zuten. Gaur egun oraindik gordetzen da, baina seguritateagatik bi ertzetan itxita dago.
Eibar gero eta handiago egiten ari zela, XX mende hasieran ur hornidura bermatzea behar zen. Irtenbideren bat Sagar-errekako urak erabiltzea izan zen. Horrerarako presa bat egin zuten Sagar-errekan, eta tunel handi baten bidez ura Eibarra eruan.
Hasieran, presatik tunelera erretenak egin zituzten, ura eruateko, harriz estalita. Tunel handia Errekatxua inguruan hasten zen, eta Eibar aldera joaten zen. Gerra ostean ur gehiago hartu zuten hainbat erreketatik, denak tutuen bidez tunel handira bideratuz. 1975 urtean presa berria egin zutenean, tunel handirako erreten berriak egin zituzten. Gaur egun tunel handia aprobetxatu izan dute Urkulutik Eibarra datorren tutua bertatik pasatzeko.
