I am getting light flickering in my Eevee animation render, but not in the viewport. I have tried with no volumetric light clamping, and with values of a wide range, and disabling soft shadows, but nothing stops the flickering.
To be honest, I’m not sure what result you are expecting in that scene. You have a mesh that in each frame it abruptly changes the shape. If this mesh has lamps associated with it, I suppose that the changes in lighting will also be abrupt.
Are you intentionally using the Noise texture to generate mesh/displace random changes in each frame? https://docs.blender.org/manual/en/2.79/render/blender_render/textures/types/procedural/noise.html
Maybe using another type of static texture?
Also, since the dimensions of your tunnel are very large, you may want to increase the Clip End values for the camera.