Chapter 140: Chapter 139: The Unprincipled Merchant's Costless Trading_1

The things stored in the box were not the survival items that Dong Tianyu had imagined, but many grey-white stones.

If it had been earlier, Dong Tianyu might not have known what those stones were, but recently he had 'voluntarily contributed' three hundred kilograms of nitrate, so his impression of it remained quite vivid.

Before Dong Tianyu could divert his eyes, he heard Ye Liuyun's smug voice, "This time I got a lot of nitrate. Later I'll also get some ice for you folks, so you can cool off."

Upon hearing Ye Liuyun's words, the security personnel revealed joyful expressions on their faces.

The weather outside was so hot now, and although they had some heat prevention measures here, it was still very hot. Although there was hardly anyone coming in and out during the day, they still had to keep watch.