A few years ago, a lot of manhole explosions occurred in Rio de Janeiro. The problem, IIRC were electric cables laid underground in the sewer galleries, that ignited the methane gas (genius, eh?). At the time, people joked how Rio became an urban minesweeper field.
Not sure what happened in Singapore. Maybe the lightning itself ignited the methane gas. Maybe the lightning heated the manhole cover and it ignited the gas. Maybe the lightning caused an overload in the electric grid that caused a spark inside the gallery that ignited the gas. Or maybe the earth just farted scared of the thunder.
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The City of Berkeley, California, would like to remind you that access portals to underground infrastructure are no longer manholes. Instead, they are to be called maintenance holes.
That’s what they are … They are not holes made of men…
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Are we supposed to be outraged by that or why are you reminding us?
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Not like we have real problems to deal with here in America… clearly the source of all our ills is “woke” culture that accurately describes shit… /s
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Well, good thing this wasn’t in Berkeley, then, or there’d be hell to pay! 
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I mean…Adrian is a girl’s name.
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So who maintains your hole?
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Maintaining the manhole got four stars on pornhub.
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LOL…
Still LOLing…
… aaaand my manhole just exploded.
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“You’re Thor? I can hardly walk!”
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Pretty Thor I heard that!
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Cha! Here in Detroit, we don’t need no stinkin’ lightning!
Manhole Covers Blow in Downtown Detroit - Feb 3rd, 2015
Blown manhole cover in Greektown landed on roof of 10 floor hotel - Aug 03, 2017
My next door neighbor was working at the hotel whose roof caught that manhole cover during both of these events! 
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I’ve been in plenty of parking garages that had only one entrance and exit.
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