The border between Gaza and Egypt has long been a difficult place to live. It's extremely isolated, with some towns divided among separate powers and limited options for exit. Some Arab cities once had some hope in friendly relations with Egypt but that border was also closed when Hamas took control of the government.
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Even once the border was shut down, certain cities made use of underground tunnels that connected them to Egypt. People smuggled goods through these tunnels, such as clothing and products. They were also used to smuggle weapons and were, therefore, considered a security threat. These tunnels have been targeted in the past by both Egypt and Israel but have often managed to be rebuilt.
Now, it appears the tunnels may be permanently closed because Egypt has flooded them with sea water. The official word from authorities is that they are constructing a fish farm.
Read more about the Gaza tunnels:
BBC: Egypt 'starts flooding Gaza tunnels'
Al Jazeera: Strangled: Gaza after Egypt floods tunnels