"Doctor, are you sure it's okay?" Conan asked, sitting in the passenger seat, looking worriedly at the road outside.

"Uhhh Dr. Asa was also a little unconfident, because the situation was really not quite right - the Beetle was not driving on a good asphalt road, but on a potholed, gravel-ridden mountain road.

"Anyway," Qian Yu also leaned against the window, looking outside, worried. "We're certainly not on the right track."

"What's more, we've been driving for too long," Gray Yuan Ai glanced at Qianyu's watch beside him. "It's been driving for over an hour."

"There's worse to come," Conan let out a lamentation as he glanced at the dashboard. "It's over!"

"Huh?" As soon as Qianyu made a questioning sound, he immediately let out a "bang" sound - it was not Qianyu's mouth that made the sound, but the head of Qianyu and the passenger seat back in close contact.

The car began to slow down and then stopped in place.

"The engine is broken?" Touching his sore head, Chiba looked at the hood at the front of the Beetle. "There's no smoke... What's going on? ”

"Hey, hey, hey?" Dr. Asasa was shocked and tried to twist the keys, but the car could not be restarted.

"It's not a mechanical failure, it's a lack of oil!" Conan was speechless. "Doctor, didn't you refuel?"

"Ahh Dr. Asasa wailed in hindsight. "Oh my God!! I forgot!! ”

"What should I do?" Qian Yu also glanced at his watch - three and six minutes. "I think I have reason to suspect that we have penetrated forty or fifty kilometers into the old forest deep in the mountains, and it may take eight or nine hours to get out."

"Doctor," Conan asked. "Use your mobile phone to call the repair department and ask for help!"

"Oh yes!" Dr. Asa took out his phone with relief, but after one glance at it, it wilted again. "No signal...

"Uhhh Qian Yu sighed helplessly and leaned back on the back of the seat. "What now?"

"Do we still have water and food?" Gray Plains asked.

"Wait a minute," Conan suddenly thought of something. "If we make good use of the rest of the water in the tank, maybe we can let this Beetle drive another ten kilometers or so?"

"Water?" Qian Yu was slightly stunned, and then reacted to what Conan meant. "Are you going to take the water out of the tank and use the oil at the bottom of the tank?"

"Qianyu-kun, what do you mean by this?" What Chiba said seemed to Ayumi to be almost a dumb riddle, so Ayumi asked.

"Do you know how cars work?" Qian Yu thought for a moment, organized the language, and replied. "The gasoline in the car's tank is pumped out by a pump through a pipe on the side wall of the tank to drive the four-stroke engine. Because the oil pipeline is connected to the side wall of the fuel tank, at the bottom of the fuel tank, there will be a part of the oil left at the bottom of the fuel tank, which cannot be pumped out by the oil pump, and naturally cannot be used. Water is heavier than gasoline, so if you pour some water into the tank, you can hold up the gasoline at the bottom of the tank, and the gasoline can be pumped in, and the car that is already out of gas can drive a little longer. ”

"But we're afraid we can't do that right now." After Qian Yu finished explaining, Gray Yuan looked at the terrain in front and behind and complained. "There are slopes in the front and rear, and if you do pour water, it is likely that the water will be pumped into the engine when the car climbs because the fuel tank is tilted."

"yes... Conan tapped his forehead in pain. "But I really can't think of a good way ... I'm afraid I'll have to give up the car first and walk ahead. ”

"What about that night?" Qian Yu glanced at the dirt road in the woods ahead that he didn't know how far away, and pouted. "Desperate or walking back?"

"You can't afford to take the risk... Conan is obviously having a headache with this as well. "But if we go back here for the night, we don't have enough food to replenish our energy. If you spend the night here, you will definitely be much less able to go hungry tomorrow than you are today. ”

"Let's take a look first," Chiba shrugged. "The question of whether to keep walking or turning back is just discussed on the way. Maybe there's a village just a short distance ahead. ”

。。。

I don't know how long I walked, but there was a sudden sound of water flowing in front of me, and I didn't know when, a stream flowing through the side of the mountain road appeared not far in front of everyone.

"This..." Before coming to the stream, Qian Yu looked at the direction and speed of the stream, and was slightly surprised.

"There's a creek here?" Motota ran behind Chiba and looked curiously at the scene in front of him.

"I think this creek has something to do with the lake we saw earlier, and I'm afraid this is the upstream source of that lake." Thousand Feathers shrugged.

"Won't it?" Ayumi, who arrived later, glanced at the width of the stream. "How big is such a small river in the upper reaches of a lake?"

"Did you see it from the leaves?" Conan's voice rang out from behind several people.

"Leaves?" Ayumi and Motota were stunned. "Where are the leaves?"

"In the water," said Qianyu, motioning to look at the stream, which from time to time had a leaf or two of strange shapes running down the stream. "This leaf does not match the tree species on both sides, it should be floating upstream, and the same leaves are floating in the lake, so they should have the same water source, and it is likely that this creek is the upstream of the lake."

"Doctor," Qian Yu said, looking at the water source. "Do you have a bottle with you? Just in case, we're afraid we'll need to fill it with some water! ”

No response.

"Doctor?" Confused, Chiba turned back to see Dr. Asa sitting on the side of the road with his head down. "Doctor, what's wrong with you?"

When Conan saw Dr. Asasa's strange appearance, he immediately ran to his side. "Doctor, what's wrong???"

"It hurts... Dr. Asa stroked one of his ankles and gritted his teeth.

"Sprained ankle? Or is it a broken bone? Chiba looked at Dr. Asasa's injured ankle with a worried expression. Can I move? Try it a little and don't move again if it hurts. ”

"I can barely move... But it hurts... Dr. Asasa had large beads of sweat on his forehead.

"Has the pain lessened or has it remained intensifying?" Gray Plains asked.

"It still hurts, but it's a little lighter... Dr. Asa replied.

"I'm afraid I won't be able to move freely for the time being, but I'll be able to recover soon. However, the doctor is in dire need of rest now. Gray Plains came to a conclusion.

"It's not good... Qian Yu frowned. "We certainly can't abandon the Doctor now, but that means we probably won't be able to move on...

"Hey..." Yuantai's demented voice made everyone look at him curiously, only to see him pointing to the way everyone came from and said. "That's...

"A car?"

In the direction where several people came, an off-road vehicle came galloping.