The most likely answer is dual collapse into a lava tube.
最有可能的答案是熔岩坍塌导致的。
The rough, rocky floor of the Indian Tunnel lava tube.
粗糙的，岩石层的印度熔岩隧道管。
The crust eventually becomes a rigid roof, forming a lava tube.
地壳最终成为一个僵化的屋顶，形成了熔岩管。
Therese Madden, third from left, in Viogelmir, a lava tube cave in Iceland.
特蕾泽梅登，左起第三个，在Viogelmir，冰岛的一个熔岩洞。
He kept out deadly fumes wearing his own gas mask and sucked water from a lava tube.
他带着防毒面具将浓烟雾挡住，从熔岩管中吸水喝。
Scientists believe these holes form when the ceiling of a subterranean lava tube collapses, possibly due to a meteorite strike.
科学家认为，地下熔岩洞顶部的坍塌或流星的撞击，都是这些月球坑形成的原因。
Because there were roof collapses at several places along the lava tube that formed Indian Tunnel, it is possible to enter on one end and come out the other side.
因为有沿熔岩隧道管，形成了印度一些地方的屋顶坍塌，有可能进入一端出来的另一面。
An international team of scientists say they've discovered a protected lunar "lava tube" - a deep, giant hole - that might be well suited for a moon colony or a lunar base, CNN reported Sunday.
据美国有线新闻网3日报道，一个国际科学小组宣布，他们在月球上发现了一个又大又深的垂直"熔岩洞"，可能适宜人类移民月球或修建月球基地。
It's unknown whether the lava is residual material that's draining through the underground tube system or if the flow is still being supplied by lava from the crater, scientists say.
科学工作者们说，不知道熔岩是否是地下管道系统排出的残留物质，或者是否火山口的熔岩仍然在提供流量。
It's unknown whether the lava is residual material that's draining through the underground tube system or if the flow is still being supplied by lava from the crater, scientists say.
科学工作者们说，不知道熔岩是否是地下管道系统排出的残留物质，或者是否火山口的熔岩仍然在提供流量。
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