Follow a Spline to a Loop

Hello, im trying to setup a MainMenu camera that would follow a spline upon the game start.

The camera would start in a dark tunnel and follow a spline until a specific point.

Then the camera should make a large loop movement and repeat it forever.

here is the idea :

Can i do this with a single spline ? or should i use 2 different spline and make the camera snap from one to the other somehow ?