The underground penetrating drill rod antenna

地下钻杆透层 天线

Introduced some new type underground mobile communication system such as leakage communication system distributed antenna communication and region mobile communication etc.

介绍了多信道漏泄通信系统、分布 天线通信系统和小区制移动通信系统等一些新型 矿井移动通信系统。

Such a hole is likely used as an underground antenna able to recharge the batteries of submarines in the Pacific and Indian Ocean through ELF broadcasts .

这种黑洞很可能用作 地下 天线能够充电电池潜艇在太平洋和印度洋，通过极低频广播。