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Sub floor ventilation

Our 1950s house has a significant subfloor area but was not built with any ventilation. The sub floor area is cinder block without any passive ventilation. I believe we need at least some passive ventilation openings to move fresh in in and out of the space. But we may need more than this... I have attached some photos for reference. And further information.. The property is split over two level and is built on a section that slopes to the South East. There is no internal access between the top and bottom level. The ventilation issues are isolated to the bottom level. (The comments below only apply in regard to the bottom level.) As you can see from the photos, the East wall is completely exposed, most of the south wall is exposed and a small part of the West wall is mostly underground. The North half of downstairs slopes upwards to the West and has absolutely no ventilation. The East side of the South half is also sealed, however the West side of the South half has a window and and a set of french doors. Hopefully the pictures also help to make sense of the property - to help understand the photos: 4487 = shows the West wall. 4488 = shows the South wall. 4489 = shows the East wall. 4492 = shows the North half of the east wall from the inside. 4494 = is looking up toward the North half of the East wall. I have also attached a copy of the floor plan for downstairs with length and measurements. In terms of height, the North half of the East wall is approx 1.9m high and slopes up to approx 0.5m by the time it reaches the West wall. The walls in the South half are approx 2.1 high.