How did Gaza’s sea become a wall?

"Israel's 18-Year Naval Blockade of Gaza: A Complex Web of Politics and Humanitarian Concerns For nearly two decades, Israel has maintained a strict naval blockade around the Gaza Strip, restricting the flow of goods and people in and out of the coastal territory. The blockade, which was imposed in 2007, was initially put in place to prevent Hamas, the Islamist group that controls Gaza, from importing arms and materials for military use. However, critics argue that the blockade has also had a devastating impact on the civilian population, exacerbating poverty, food insecurity, and a severe lack of access to medical care and other essential services. As the blockade enters its 18th year, international pressure is mounting on Israel to reconsider its policy and find a more humane solution to the crisis in Gaza."

For 18 years, Israel has enforced a naval blockade around the Gaza Strip.