What episode of X-Files is this?!

Question: All I remember is, at one point, a craft (I believe Alien) crashes into a Lake (or maybe ocean) and Mulder dives in and while he's swimming underwater he finds a being.

---

---

Answers: All I remember is, at one point, a craft (I believe Alien) crashes into a Lake (or maybe ocean) and Mulder dives in and while he's swimming underwater he finds a being.

---

---

When a UFO crashes into the Great Sacandaga Lake, the episode is called "Tempus Fugit", Part 1 of 2 (season 4 episode 17).

And, the episode where Mulder dives into the lake is called "Max", Part 2 of 2 (season 4 episode 18).

---

---

---