Mythozz , ksereis ti ginete me tis kammeres sta tounel tis perimetrikhs sthn patra? mporoun na katagrapsoyn kai na pistopoihsoun parabash oriou taxythtas? ypo8eto oti se egrapasan sthn megalh ey8eia meta to teleytaio toynel ,apo rio pros glayko, meta thn eglykada kato apo thn gefyra opoy thn sthnoun panta (giati exei iskio).genika sthn perimetrikh ths patras, gia osous thn xrhsimopouyn, oi troxaia kanei mploko sto parapano shmeio opou kalo 8a einai na mhn ksepernate poly to orio otan pernate. Otan prosperasete to 'epikindino logo troxaias' shmeio ola kala mporeite aneta na piasete telikh.