We study knots in 3d Chern-Simons theory with complex gauge group
SL(N,C), in the context of its relation with 3d N=2
theory (the so-called 3d-3d correspondence). The defect has either co-dimension
2 or co-dimension 4 inside the 6d (2,0) theory, which is compactified on a
3-manifold M^. We identify such defects in various corners of the 3d-3d
correspondence, namely in 3d SL(N,C) Chern-Simons theory, in 3d
N=2 theory, in 5d N=2 super Yang-Mills theory, and in
the M-theory holographic dual. We can make quantitative checks of the 3d-3d
correspondence by computing partition functions at each of these theories. This
Letter is a companion to a longer paper, which contains more details and more
results.Comment: 6 pages, 3 figure