Sherman Tank, Hatches- Can they be locked from the inside?

[Flying10uk]

Last night I watched the Film "Fury" staring Brad Pit and more importantly, to us, a Sherman Tank. The film seems to suggest that once the crew has climb inside the hull and closed down/secured all the hatches they can't actually be locked shut from the inside and the hatches can still be opened from the outside without having to release anything from the inside first. We are talking about a normal standard, as issued, WW2 Sherman Tank with no special modifications.

Is the film correct; there is/was no method of locking the hatches shut from the inside? I can see the logic in being able to open the hatches from the outside if for example the crew had been seriously injured by an A.P. round hit but I can also see the logic in wanting to lock the hatches from the inside if you wish to keep "undesirables" out.

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