The entire class 1-A goes on a trip to a laboratory....

They go for a walk because some experiments are heroes and they are giving them more powers

5 police officers and 5 scientists and class 1-A, the scientists direct them to the Room of Failed Experiments

they enter the room

Scientist: this is the Room where our mistakes are, that is... Our failed experiments...

Aizawa: Allow the students to approach carefully...