secret worlds: gel processing site
After using the first bomb slot, space jump on the pump tower and grapple the maintenance rail on your right. Go to the other maintenance rail and jump off slightly, holding down about a half second later so you land on the pump tower's edge. Grapple the rail and morph when it touches you.
Once inside the pump tower, roll to the opposite end. Near the end of the tunnel you'll need to slow down, because when you exit you'll fall out of the room. If you roll too far out, you won't be able to unmorph and enter the secret world. With that in mind, properly exiting the tunnel is easy as long as you move slowly.