  Single strontium atoms held in optical tweezers have so far only been imaged
using the broad $^{1\hspace{-0.3ex}}S_0$-$^{1\hspace{-0.3ex}}P_1$ transition.
For Yb, use of the narrow (183 kHz-wide)
$^{1\hspace{-0.3ex}}S_0$-$^{3\hspace{-0.3ex}}P_1$ transition for simultaneous
imaging and cooling has been demonstrated in tweezers with a magic wavelength
for the imaging transition. We demonstrate high-fidelity imaging of single Sr
atoms using its even narrower (7.4 kHz-wide) $^{1\hspace{-0.3ex}}S_0$ -
$^{3\hspace{-0.3ex}}P_1$ transition. The atoms are trapped in
\textit{non}-magic-wavelength tweezers. We detect the photons scattered during
Sisyphus cooling, thus keeping the atoms near the motional ground state of the
tweezer throughout imaging. The fidelity of detection is 0.9991(4) with a
survival probability of 0.97(2). An atom in a tweezer can be held under imaging
conditions for 79(3) seconds allowing for hundreds of images to be taken,
limited mainly by background gas collisions. We detect atoms in an arrary of 36
tweezers with 813.4-nm light and trap depths of 135(20) $\mu$K. This trap depth
is three times shallower than typically used for imaging on the broad
$^{1\hspace{-0.3ex}}S_0$ - $^{1\hspace{-0.3ex}}P_1$ transition. Narrow-line
imaging opens the possibility to even further reduce this trap depth, as long
as all trap frequencies are kept larger than the imaging transition linewidth.
Imaging using a narrow-linewidth transition in a non-magic-wavelength tweezer
also allows for selective imaging of a given tweezer. As a demonstration, we
selectively image (hide) a single tweezer from the array. This provides a
useful tool for quantum error correction protocols.
