diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..eb391ac3
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,20 @@
+[submodule "third_party/ukey2"]
+	path = third_party/ukey2
+	url = sso://team/nearby-eng/ukey2
+	branch = master
+[submodule "third_party/protobuf"]
+	path = third_party/protobuf
+	url = https://github.com/protocolbuffers/protobuf
+	branch = master
+[submodule "third_party/gtest"]
+	path = third_party/gtest
+	url = https://github.com/google/googletest
+	branch = master
+[submodule "third_party/absl"]
+	path = third_party/absl
+	url = https://github.com/abseil/abseil-cpp
+	branch = master
+[submodule "third_party/smhasher"]
+	path = third_party/smhasher
+	url = https://github.com/aappleby/smhasher
+	branch = master
diff --git a/third_party/absl b/third_party/absl
new file mode 160000
index 00000000..62f05b1f
--- /dev/null
+++ b/third_party/absl
@@ -0,0 +1 @@
+Subproject commit 62f05b1f57ad660e9c09e02ce7d591dcc4d0ca08
diff --git a/third_party/gtest b/third_party/gtest
new file mode 160000
index 00000000..61f010d7
--- /dev/null
+++ b/third_party/gtest
@@ -0,0 +1 @@
+Subproject commit 61f010d703b32de9bfb20ab90ece38ab2f25977f
diff --git a/third_party/protobuf b/third_party/protobuf
new file mode 160000
index 00000000..c6493970
--- /dev/null
+++ b/third_party/protobuf
@@ -0,0 +1 @@
+Subproject commit c6493970296fa5c5b4a81a37248a328579fe9662
diff --git a/third_party/smhasher b/third_party/smhasher
new file mode 160000
index 00000000..61a0530f
--- /dev/null
+++ b/third_party/smhasher
@@ -0,0 +1 @@
+Subproject commit 61a0530f28277f2e850bfc39600ce61d02b518de
diff --git a/third_party/ukey2 b/third_party/ukey2
new file mode 160000
index 00000000..2fc30c88
--- /dev/null
+++ b/third_party/ukey2
@@ -0,0 +1 @@
+Subproject commit 2fc30c8894da17442c476d9416b5a811bfe88e32