  We estimate the extent of overshooting inwards from the bottom of the
intershell convective zone in thermal pulses in (S)AGB stars. We find that the
buoyancy is so strong that any overshooting should be negligible. The
temperature inversion at the bottom of the convective zone adds to the
stability of the region. Any mixing that occurs in this region is highly
unlikely to be due to convective overshooting, and so must be due to another
process.
