Thanks to Steel!

Aqualad: He’s buff, charming and can breathe underwater. Just when Beast Boy is about to show off his ability to change into a menagerie of underwater creatures, Aqualad shows up. This hero of the deep joins the Teen Titans to stop a mysterious amphibious villain named Trident, who has stolen a boatload of toxic waste.

Tram: Tram is Aqualad's Mr. Fix It. When the T-Sub came in badly damaged and in need of severe repairs, Tram got to work right away to repair everything that was damaged during Trident's attack.

Tram later filled in for Beast Boy and helped seal off the entrance to Trident's cloning area, allowing him to see his newly repaired sub in action--seismic blasters and all