AnyTag sections = data.get(LEVEL_SECTIONS);
if (sections.isList()) {
int[] heightmapData = extractHeightmapData(data);
byte[] chunkData = new byte[CHUNK_BYTES];
extractChunkData(data, chunkData, new byte[CHUNK_BYTES]);
caves = new CaveLayer(chunkData, heightmapData);
} else {
caves = CorruptLayer.INSTANCE;
}
}