The tunnel was too narrow, barely fitting for Markus's huge body. Secondly there was no light at all. But thankfully Markus had come prepared beforehand, carrying a torch. But the problem was carrying the torch while climbing down this narrow tunnel.
Plus once inside, he couldn't make out what time it was outside. All those who were brought here were only given basic clothes and food. No more, no less. Not to mention something like a watch.
But Markus knew that he had entered this tunnel at around 9 pm. And he had already decided to come out of this tunnel by 4 am, before the guards were called for training.
With this thought in mind, he started counting, trying to match his pace with seconds of the watch. He tore a piece of his cloth, tying it around his neck with the torch attached to it.
This way, he made it much easier to climb down with the help of both of his hands. Thus without any more delay, he started the journey downstairs.