I roto i ngā kaupapa whakawhānui i te ara raro whenua o ngā tāone nui, he mahi tino nui, he mahi mōrearea hoki te pupuhi i te whakawhānui i te teihana. Hei kaihanga e tohunga ana kikeri tokamīhini, ka whakauruhia e mātou te YT28wiri toka waewae hau—he taputapu ngaio kua hangaia mō ngā taiao whaiti me ngā taiao e hiahia ana ki te tika. Ko teYT28Ka whakakotahihia e te hoahoa hau mama engari pakari me te pūnaha tautoko waewae pumau, e āhei ai ngā kaiwhakahaere ki te mahi keri poka pahū tika i ngā wāhi kuiti. Ko tana aratau keri mākū ka pehi i te puehu, ka whakaiti i te whakaputanga wera, ka roa ake te ora o te mata o te keri, ko te tikanga pānga maeneene ka whakarite i te kaha patu rite tonu, ka whakaiti i te pekapeka i te wā keri. Mā ngā tohu tūnga mārama me ngā koki waewae ka taea te whakarerekē ka āwhina i te whakatutuki i te whakaritenga poka tika, he mea nui hei karo i te kino ki ngā hanganga kauhanga o nāianei me te whakarite i ngā putanga pahūtanga whakahaere.

I mua i te whakamahi i te YT28, he maha ngā wāhi keri me te keri rua i whakawhirinaki ki ngā keri toka tuku iho, ki ngā tikanga keri ā-ringa rānei, ā, he maha ngā wā ka puta he wero pēnei i te peka o te poka, te wiri nui, me te parahanga puehu. Nā ēnei take i hua ake ai he pānga pupuhi kore taurite, he tūponotanga mōrearea haumaru, me te roa o ngā wā kaupapa. Whai muri i te huri ki te YT28, i kōrero ngā kaiwhakahaere i ngā whakapainga nui: kua piki ake te tika o te keri ma te 40% pea, me ngā hapa whakarite poka kua whakaitihia ki roto i te 3 cm i roto i ngā paparanga toka uaua. I whakapai ake hoki te pūnaha keri maku i ngā āhuatanga mahi mā te whakaheke i ngā taumata puehu hau ma te neke atu i te 80%, me te whakarei ake i te tirohanga me te haumaru manawa mō ngā kaimahi. I roto i tētahi kaupapa whakawhānui teihana metro tata nei i roto i tētahi rohe tāone nui kua hangaia, i taea e te YT28 ngā kaimahi ki te whakaoti i te wāhanga pupuhi whakanui e rua wiki i mua i te wā kua whakaritea, me te kore he aituā o te pakaru o te pakitara o te rua tata. I kitea te pakari o te taputapu i te mea i pupuri tonu i te mahi pumau mā te mahi tonu i roto i ngā taiao makuku, kirikiri me te kore he nui o te kakahu.

Mō ngā kaiwhakawhanake hanganga me ngā tohunga keri rua, ehara i te mea he keri noa iho te YT28—he taputapu tika e whakataurite ana i te mana, te whakahaere, me te haumaru o te kaiwhakahaere. E whakaata ana tōna hoahoa i ngā tekau tau o te wheako o tā mātou wheketere ki te whakawhanake i ngā otinga keri toka mō ngā tono wero o raro whenua. Ka whakaratohia e mātou te tautoko hangarau katoa, tae atu ki te aratohu i runga i te papaanga mō te tūnga waewae, te whakatikatika i te auau pānga, me te tiaki i te pūnaha patupatu kua hiritia ki te wai. Ka whakamatautauria ia waeine i raro i ngā āhuatanga wāhi iti kua whakatauirahia i mua i te tukunga hei whakarite i te pono. I te whakawhānui ake o ngā tāone puta noa i te ao i ā rātou whatunga kawe waka raro whenua, ka tipu haere tonu te hiahia mō ngā taputapu keri tika, whai hua, me te haumaru. Ka tutuki i te keri toka waewae YT28 tēnei hiahia mā te huri i ngā mahi pupuhi uaua ki ngā mahi whakahaere, matapae—ka whai wāhi ki te whanaketanga hanganga tāone haumaru, tere, me te ohanga ake.