  While modelling the galactic chemical evolution (GCE) of stable elements
provides insights to the formation history of the Galaxy and the relative
contributions of nucleosynthesis sites, modelling the evolution of short-lived
radioisotopes (SLRs) can provide supplementary timing information on recent
nucleosynthesis. To study the evolution of SLRs, we need to understand their
spatial distribution. Using a 3-dimensional GCE model, we investigated the
evolution of four SLRs: Mn-53, Fe-60, Hf-182, and Pu-244 with the aim of
explaining detections of recent (within the last $\approx$1-20 Myr) deposition
of live Mn-53, Fe-60, and Pu-244 of extrasolar origin into deep-sea reservoirs.
We find that core-collapse supernovae (CCSNe) are the dominant propagation
mechanism of SLRs in the Galaxy. This results in the simultaneously arrival of
these four SLRs on Earth, although they could have been produced in different
astrophysical sites, which can explain why live extrasolar Mn-53, Fe-60, and
Pu-244 are found within the same, or similar, layers of deep-sea sediments. We
predict that Hf-182 should also be found in such sediments at similar depths.
