The D5V-2 Massacre

Years ago, a massacre occurred on the D5V-2 Model Submarine. When interviewed, the man behind the gruesome attack only had this to say:

"I heard the frequency. They told me what was in the ocean. They said they couldn't hear. I couldn't let them see."

Analysis of the previously mentioned radio broadcasts revealed white noise at 4.5 Hz. More to follow.

Controls:

A/D - Move Left/Right

W/S - Move Up/Down Ladder

E - Interact 

Left-Shift - Run/Climb Faster

M - Toggle Map