  A recent analysis of UV data from the Interface Region Imaging Spectrograph
{\em IRIS} reports plasma "bombs" with temperatures near \hot{} within the
solar photosphere. This is a curious result, firstly because most bomb plasma
pressures $p$ (the largest reported case exceeds $10^3$ dyn~cm$^{-2}$) fall
well below photospheric pressures ($> 7\times10^3$), and secondly, UV radiation
cannot easily escape from the photosphere. In the present paper the {\em IRIS}
data is independently analyzed. I find that the bombs arise from plasma
originally at pressures between $\lta80$ and 800 dyne~cm$^{-2}$ before
explosion, i.e. between $\lta850$ and 550 km above $\tau_{500}=1$. This places
the phenomenon's origin in the low-mid chromosphere or above. I suggest that
bomb spectra are more compatible with Alfv\'enic turbulence than with
bi-directional reconnection jets.
