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We summarize the results and the ideas in 1707.06152, 1707.06154, 1807.07768where new warped $\mathrm{AdS}_3$ backgrounds are derived in massive IIA stringtheory by uplifting exact solutions in $\mathcal N=1$, $d=7$ and $\mathcalN=(1,1)$, $d=6$ gauged supergravities. These solutions are respectivelyasymptotically $\mathrm{AdS}_7$ and $\mathrm{AdS}_6$ and they are related tothe D2-D4-NS5-D6-D8 brane intersection. We provide a particular supergravitysolution in 10d describing this bound state and we discuss the relationsbetween its near-horizon geometry and the uplifts from 6d and 7d. Then we givethe holographic interpretation of these $\mathrm{AdS}_3$ warped backgrounds interms of $\mathcal N=(0,4)$ defect $\mathrm{SCFT}_2$ within the $\mathcalN=(1,0)$ $\mathrm{SCFT}_6$ and the $\mathcal N=2$ $\mathrm{SCFT}_5$.

$\textbf{AdS}_3$ vacua and surface defects in massive IIA