I tried to find one of those at Changi on my way back from India. No dice. They're called coffin hotels.

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Oh man, I read about those things in an issue of Top Gear a few months ago. I don't know why you'd want to stay in one of those things, they sound horrible - for cheap accomodation, give me a bed in a decent backpackers hostel any day of the week over one of those things!

Here is a wiki page on the things.