Side Door Overshot Definition & Procedure For Wireline
The side door overshot method is another option for freeing a stuck logging tool.  In this method, the line is not cut and a rope socket overshot is not required. However, cut & thread fishing is typically the best option.

Fig.1 Bowen Side Door Overshot

Applications

The Bowen Series 160 fishing overshot is only recommended for fishing in cased hole environments and is run on tubing or drill pipe.  This method is preferred in shallow cased holes.
https://www.drillingmanual.com/?p=8399