I just finished watching the remastered version of "The Emissary" and thought the way that K'Ehleyr rendezvoused with the Enterprise was interesting. She was stuck inside a Class 8 probe, which looked like a photon torpedo and traveled at Warp 9 to meet the Enterprise.
How could a probe travel at Warp 9 when there is no obvious signs of any type of equipment (Warp engine) that would allow the probe to travel at such speeds?
She barely fit in the probe, had an oxygen mask and that pretty much took up all the space in the probe.
Does Starfleet have some secret Warp-nano technology?
Here are some pictures: