  We have carried out an HI survey towards X-ray central compact objects (CCOs)
inside supernova remnants (SNRs) which shows that many of them are placed
within local HI minima. The nature of these minima is not clear, but the most
likely explanation is that the CCOs have evacuated the neighboring gas. This
survey also allowed us to detect a weak, diffuse radio nebula inside the SNR
Vela Jr, probably created by the winds of its associated CCO.
