  Let $f$ be a rational map with degree $d\geq 2$ whose Julia set is connected
but not equal to the whole Riemann sphere. It is proved that there exists a
rational map $g$ such that $g$ contains a buried Julia component on which the
dynamics is quasiconformally conjugate to that of $f$ on the Julia set if and
only if $f$ does not have parabolic basins and Siegel disks. If such $g$
exists, then the degree can be chosen such that $\text{deg}(g)\leq 7d-2$. In
particular, if $f$ is a polynomial, then $g$ can be chosen such that
$\text{deg}(g)\leq 4d+4$. Moreover, some quartic and cubic rational maps whose
Julia sets contain buried Jordan curves are also constructed.
