Return To Black Mesa mod for Half-Life 2

Black Mesa, in the end of Opposing Force, was hit by a hydrogen bomb sometime between the 20th and 21st century. Although you may have thought that Black mesa has been destroyed, and is now just rubble, you are wrong. The main foundations of Black mesa are still up, due to its superior underground construction to be built as a missile base, Black Mesa is in some places, still in decent shape. Some equiptment in the facility can still be used. Equiptment that may not be found anywhere else in the world. To some scientists from the New Mexico area(Where Black mesa is situated), it can be used. The combine have taken over the world. There are movements... One of them are happening in Black Mesa. You, Alexander Petrov, are a previous Russian nuclear physicist who must find a group of scientists trying to find a way to destroy the combine. Unfortunately, no one has been able to contact them in 2 weeks. Walk new areas of the Black mesa research facility, finding away out of every problem, riddle,...