There is an interesting app for Android and iOS users called SafeTrek that you can use when in unfamiliar or potentially dangerous areas. It was originally developed by college students for college students and is extremely easy to use.
Start the app and hold a finger on the onscreen button. If you
release the button and do not enter a 4 digit security code, local
police will be notified of your location, name, and emergency. The
price is $3 per month. LINK