Alongside my house is an old coal door that was never properly sealed. Some caulk was added around the metal exterior door, and a piece of plywood nailed over the interior opening (more to keep out critters than water, I believe).
As you can see from this exterior view, there's not much I can do about removing the door itself:
But on the inside there is a cavity that could be filled in somehow:
The framing inside here was metal -- it's mostly rusted out now -- and there is a little bit of daylight making its way through. This is very obviously not watertight.
The house has a brick and mortar foundation. What's the right way to seal this up to keep water and critters out?