  We construct a simply connected $2-$complex $C$ embeddable in $3-$space such
that for any embedding of $C$ in $\mathbb S^3$, any edge contraction forms a
minor of the $2-$complex not embeddable in $3-$space. We achieve this by
proving that every edge of $C$ forms a nontrivial knot in any of the embeddings
of $C$ in $\mathbb S^3$.
