The pyramid has three entrances. The left and right entrances are on the first floor, and the middle entrance is on the second floor. Enter from the rightmost one. Keep walking up and you will see a door. There is a piece of paper on the wall next to it, which is actually a computer. After investigation, enter the password 4673, and then press open to open the door. After entering, investigate the computer on the far left and select down to find the red tank (I named it Blood God). But it can't be opened. The engine and C device are missing. Lower the middle one and you can get the engine: チョノフTI. Lower the one on the right to get the C device: ウォズニアクSI, and then you can return to the dock village
PS: If you have any questions, you can go to Baidu MM2 Bar to ask them