The excavated, enlarged opening was nearly a thousand meters from the true entrance. To connect the opening to the Underground Space's original entrance, they needed to use a relay method.
Naturally, Rhine's subordinates handled this. A Wind Element Ability User held a launch gun and fired at a point a hundred meters away. The projectile head had an automatic locking clasp; once it entered the rock, it would lock itself in place and could bear roughly five hundred kilograms.
A thin steel cable was attached to the rear. Once the projectile head locked into place, the person operating the launcher pulled back the thin cable, drawing over a slightly thicker one.
Repeating the process, they sent a thumb-thick steel cable to the projectile head and secured it. Using the cable's slight downward angle, people could slide directly across to the projectile head's location. Those who crossed carried a cable launcher and a thin steel wire.
Then they fired the next projectile head and repeated the process.
After several repetitions, the Wind Element Ability User reached the true entrance.
After briefly inspecting the area, he found no dangers or mechanisms.
He then used the hand drill he carried to bore several holes, drove high-strength rock bolts into the stone to form a load-bearing winch, placed the thin steel wire he had brought over onto the winch, and used the radio to have the others pull the wire back.
In this way, the thin steel wire gradually became a thick steel cable. Once it could bear over a thousand kilograms, they sent over bolt guns and continued driving bolts into the rock to reinforce the winch.
Only then did they send over the supplies and personnel. The entire process went smoothly. Since the excavated opening was slightly higher to begin with, once