After heading deeper than 300 m, Zhang Tie found that the whole cave became dimmer. The night vision medicament started to work. What Zhang Tie saw was a faint yellowish-green world, in which, everything became very clear. This made Zhang Tie let out a sigh.
Besides Zhang Tie and his cousin Zhang Su, there was a total of 20-30 people who entered the Dragon Cave together. The team lasted about 100 m. People who were familiar with each other would stay together while those who didn't know each other would keep their distance and be cautious of those around them. Those people who were experienced with the underground world clearly knew that besides those terrifying magical beasts and monsters that could kill people, many would be killed by others due to various reasons each year. What was more gloomy and dangerous than this underground world was a person's heart.
