  We report the results of the CO $\textit J$=1-0 and SiO $\textit J$=2-1
mapping observations towards the broad-velocity-width molecular feature CO
16.134-0.553 with the Nobeyama Radio Observatory 45 m telescope. The high
quality CO map shows that the 5-pc size broad-velocity-width feature bridges
two separate velocity components at $\textit V_{\rm{LSR}}$$\quad$$\simeq$ 40 km
s$^{-1}$ and 65 km s$^{-1}$ in the position-velocity space. The kinetic power
of CO 16.134-0.553 amounts to $7.8\times10^2$ $\textit L$$_\odot$ whereas no
apparent driving sources were identified. Prominent SiO emission was detected
from the broad-velocity-width feature and its root in the $\textit
V_{\rm{LSR}}$$\quad$$\simeq$ 40 km s$^{-1}$ component. In the CO Galactic plane
survey data, CO 16.134-0.553 appears to correspond to the Galactic eastern rim
of a 15-pc diameter expanding CO shell. An $1\deg$-diameter H I emission void
and $4\deg$-long vertical H I filament were also found above and below the CO
shell, respectively. We propose that the high-velocity plunge of a dark matter
subhalo with a clump of baryonic matter was responsible for the formation of
the H I void, CO 16.134-0.553/CO shell, and the H I filament.
