Jonathan waited for a while, then decided that his voice was not heard. Immediately, he started running again, despite his fatigue. 

Finally, the reached the hull of the Airship, again while barely not collapsing on the ground. When he has caught his breath, he started observing the Airship from this angle. Despite its rough appereance (Nothing unexpected for a ship that survey the Scar), it was a truly beautifully designed and equipped ship. 
He could not find an easy way in, however. He could try to repeat his rock and use the echo to make his existence known, but a better idea popped up into his mind. 
"Stewart, start climbing up the Airship. Feel free to use the hull to help you, but return it to its original shape after each step.Once you're on the bridge, redirect survivors to my position."
He then turned to the larger robot. "Margaret, come over here and help me. I know this is not your area of expertise, but collect me some metal. We're making a staircase to the bridge. "