How to seal with silicone a glass bricks wall, and prevent water penetration

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Important warning and disclaimer:
Anyone who acts or practices according to what is demonstrated in this video, does so at their own risk and responsibility.
The video creator shall not be held responsible and shall not be liable in any way for the consequences of any acts exemplified in this video.
Very important - according to the law, only an electrician with a license is allowed to repair electrical repairs.
Very important - electricity is a very dangerous thing and can cause death !!!
It is very important to take all possible precautions to minimize the dangers of electric shock when dealing with electricity !!!
It is very important to disconnect the power supply (feed) to the socket\point by switching off the power switch to that socket\point.
It is advisable to disconnect all power supply (feeds) to the apartment and switch off the main power switch.
Make sure that no one in the house switches it on by mistake while you are handling\dealing with electricity !!!