  We investigate gravitational collapse of a spherically symmetric thin shell
in the Einstein-Gauss-Bonnet (EGB) gravity. Under the recently proposed 4D
limit, we find that the collapsing shell will be bounced back at a small
radius, without forming a singularity. This bouncing behavior is similar to
those of a test particle and a homogeneous spherical dust star, in accordance
with the expectation that the Gauss-Bonnet term will modify the small scale
behavior of the Einstein gravity. We analyze the causal structure of the
dynamic spacetime that represents the bouncing process, finding that the thin
shell has an oscillation behavior on the Penrose diagram, which means that the
thin shell results in a novel type of black hole with respect to observers
outside the event horizon that the collapse forms. We also find that the weak
cosmic censorship conjecture holds in this model. Further implications of such
a regular gravitational collapse are discussed.
