What effects on its surroundings do you expect from an object moving at relativistic speeds?

Say you have a superfluid ( a supercooled fluid that has lost its ability to create friction, a.k.a. Bose-Einstein-Condensate) that is also ferromagnetic, that you can accelerate in a torus, that in the constraints of this argument is indestructible. Since this fluid is frictionless, you can accelerate close to the speed of light (relativistic speed).
What effects on the immediate environment do you imagine will this setup produce?