The congressman whose district is less than 100 miles from Cuba sounded the alarm after a bombshell investigation revealed several images of advanced spy bases in the communist nation.

Rep. Carlos Gimenez, R-Fla., said in a Wednesday interview there is no doubt China has a big hand in the construction and operation of the bases.

Gimenez elaborated after the bipartisan Center for Strategic and International Studies (CSIS) released the imagery while noting China’s official activity there “remain[s] shrouded in secrecy