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In 2009, Kahn and Markovic proved the Surface Subgroup Theorem, and they actually found a large family of pi_1-injective immersed surfaces in closed hyperbolic 3-manifolds. Hamenstadt later showed that any cocompact lattice of some simple rank 1 Lie group other than SO(2m,1) (m geq 1) has a surface subgroup. In this talk, we will discuss the case of SO(4,1) and construct pi_1-injective immersed surfaces in closed hyperbolic 4-manifolds. This is joint work with Jeremy Kahn.