I have a computer on my university network. This computer is running a VNC server. From within the network, I can use the VNC server of my computer.

Normally, in order to access my machine from outside the network, I SSH into a login machine and, from it, I SSH into my personal machine (which has an internal IP address). I have root control over the viewing computer and my person computer, but I have no root control over the login computer.

How would I go about connecting to my personal computer's VNC server from outside the network?