You were riding a minecart and you arrived at door 149 and then the minecart stopped and then Guiding light shuts the door on Seek and then Seek gives up and the Minecart continues moving... but then you saw a huge entity and then you tilted the minecart to go right and then the minecart fell and you go on the ground and then Grumble starts chasing you... you arrived at a safe place and the door closed and Grumble goes away, There is a code for the bridge to open so you need to find power cells to enter the code while avoiding Grumbles

Grumble: evil laughing in the background