MADRID (AP) — The leading engineer in Spain's search, now on its fourth day, for a 2-year-old boy trapped in a deep, narrow borehole says rescuers are rushing to finish in days massive digging work that usually takes months.

Efforts to rescue Julen Rosello from the 110-meter (360-foot) deep, 25 centimeter-diameter (10-inch) borehole have gripped Spain since the boy reportedly fell into the waterhole on Sunday.

Adults don't fit through the shaft and machinery has hit an obstruction of strong material about two thirds down the vertical hole.

Angel Garcia of the Malaga province civil engineers' association told reporters on Thursday that workers' priority is now to dig two parallel vertical tunnels. That plan came up after a horizontal hole bored in the past 24 hours from a hillside hit heavy stone.