diff --git a/.gitmodules b/.gitmodules
index 86c78b3e..3fcb4af5 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "thirdparty"]
 	path = thirdparty
 	url = https://github.com/nillerusr/source-thirdparty
+[submodule "ivp"]
+	path = ivp
+	url = https://github.com/nillerusr/source-physics
diff --git a/ivp b/ivp
new file mode 160000
index 00000000..5f07fcf8
--- /dev/null
+++ b/ivp
@@ -0,0 +1 @@
+Subproject commit 5f07fcf8d385ef90336329d0ba419691c104a27e