Deep-fake updates or "intercepted" video transmissions from a fictional handler. 2. Directional Audio and Sub-Sonic Soundscapes

Some Examples of how Spy Train Toilet can be used:

Train toilets produce a constant, high-decibel white noise of rushing water and pneumatic pressure. This masks both the transmission of data (the "chirp" of a modem) and the spy's verbal confirmation codes. Modern spy train toilets use "media masking"—the film’s soundtrack is deliberately 20% louder than necessary.