This episode is about the creepy and mysterious things surrounding the USS Eldridge. 

sources: 

https://www.history.navy.mil/research/library/online-reading-room/title-list-alphabetically/p/philadelphia-experiment.html

https://www.military.com/off-duty/2020/05/04/truth-behind-wwiis-creepy-philadelphia-experiment.html

https://www.esd.whs.mil/Portals/54/Documents/FOID/Reading%20Room/UFOsandUAPs/onr_ph1.pdf?ver=2017-05-22-113513-680