The floor was sometimes caulked and filled with water to a depthof about a meter for mock sea battles.
地板有时灌满了深度约一米的水,以模拟海战。
3
Officials said the recorders needed to identify the causes of the mysterious crash could be on the ocean floor at a depthof 6, 600 to 9, 800 feet (2, 000 to 3, 000 metres).