# Fibers of the Bott-Samelson Resolution of Schubert Varieties

Is there an explicit (perhaps visual) description of the fibers of the Bott-Samelson Resolutions of Schubert Varieties? Let's fix $G$ to be $GL_n(\mathbb{C})$.

Also, how would the answer to the question above change if I replace the filed $\mathbb{C}$ with $\mathbb{F}_p$, for some prime number $p$?