It doesn't require "unzipping a zip inside a zip." It "explodes" immediately upon the first extraction attempt.
If you must open for research or because you believe it belongs to you, follow these steps: Laghar.zip
The underlying framework of a Laghar.zip file relies on a hybrid compression methodology. It utilizes standard Huffman coding paired with a specialized variation of the DEFLATE file compression sequence to maximize directory optimization. It doesn't require "unzipping a zip inside a zip