1/ We think so too although there is also an old subway under the canal locally. Not quite as grand but quite unique & used to be the only way to get from Kingsknowe to Longstone. Still a route on google maps. @scottishcanals #unioncanal 
https://twitter.com/reunioncanal/status/1381668509617373197
2/ Here's a vid of it being pumped out recently by CEC Parks team trying to find a drain cover at the origin of an old culvert carrying water from a old spring through Redhall Park. Note the weird piped outlet in the canal subway wall spewing water out as well. @scottishcanals
3/ When Redhall Park flooded last year it was because this culvert became blocked somewhere near the entrance to the park causing this fast flowing water to back up and spew out the manholes. @scottishcanals
4/ Investigations of the subway tunnel are ongoing but we'd like to see it dried out and maintained properly. It's possible an old cap on the spring has failed causing water to rise in the landscape around the canal foundations beside the subway. Waiting on further clarity.
5/ its possible this piped spring water was used in the old laundry that used to sit on the old Booker site next to Sainsbury’s.
6/ Why was a subway tunnel there? Well it used to lead directly to Redhall Old Quarry, now Dovecot Pk of course from Redhall New Quarry, now Redhall Park area. edinburghgeolsoc.org/downloads/lbgc…
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