Dungeon entrance

One more so called expendable powder magazine. There is no concrete here, only brickwork of the 1860s. There were two types of of powder magazines in Russian coastal artillery at that times. Expendable magazines are located near or even under artillery emplacements, and much more biggest reserve magazines use to be in the rear of position near sea piers or rail-ways.
Everything is in a rather deplorable state here, however, if desired and the availability of some funds, all this can be brought into a decent shape quickly enough.