In Endless Ocean 2, while exploring the Cavern of the Gods, the four divers get swept away by strangely powerful currents and end up in this room, which, for some unexplained reason, won't let radio reception get through. However, the team of divers was located in an underwater cave beneath several tonnes of rock by then, and besides that, it is highly suggested that large amounts of supernatural energy (notorious for messing with electronics: flickering lights, tv static, etc.) were present throughout the cavern in its entirety, and thus it is not all that odd for the signal to have gone out. The ankh in the statue's hand is turned a little later in the mission to reveal the Subterranean Reception Room.