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Locking manhole covers (or welding them shut) prevents assassins from easily placing bombs under them, and makes it harder for people to enter the sewers. Also,

by raphman 13y ago

Locking manhole covers (or welding them shut) prevents assassins from easily placing bombs under them, and makes it harder for people to enter the sewers. Also, manhole covers may be used as weapons or shields.

TeMPOraL 13y ago
Or selling as scrap metal.
Someone 13y ago
Aha! That bombs thing does make sense. It wouldn't be that hard to enter the sewers outside that 'government sector', and place a bomb under a manhole cover welded shut, but I guess would-be terrorists would not want to carry a few hundred pounds or so of explosives through the sewers.
- waterlesscloud 13y ago
  Assuming the sewers are even navigable for a human.
  - Someone 13y ago
    I know little about sewer systems, but if there is a manhole cover, isn't that likely?
    - aaronem 13y ago
      It could lead into a navigable system of tunnels, or it could just open onto a pit full of pumping machinery.
- PaulAJ 13y ago
  See http://tvtropes.org/pmwiki/pmwiki.php/Main/AbsurdlySpaciousSewer http://tvtropes.org/pmwiki/pmwiki.php/Main/AbsurdlySpaciousS... for more on this.