[Megatron's reasons for investigating the pillar are simple: He needs to return home, and its here.

It's been made obvious that the lambda is the cause of the dimensional rift, and right now there's something sticking out of the lambda. To him...as...odd as it might be, this might be a chance.

Someone else must have been thinking the same thing, because he realizes he's not alone as he approaches the base.]

It is more ominous than I was expecting.

[He comments, coming to a stop near Jetfire, hands on hips and looking up.] Do you think it would be possible to scale it?