} else if (column_is_open && is_under_tunnel &&
(c == biome->c_stone || c == biome->c_filler)) {
// Tunnel entrance floor, place biome surface nodes
if (is_under_river) {
if (nplaced < depth_riverbed) {
vm->m_data[vi] = MapNode(biome->c_riverbed);
} else if (column_is_open && is_under_tunnel &&
(c == biome->c_stone || c == biome->c_filler)) {
// Tunnel entrance floor, place biome surface nodes
if (is_under_river) {
if (nplaced < depth_riverbed) {
vm->m_data[vi] = MapNode(biome->c_riverbed);