Three submarine cable currently terminate in this building:
Apollo North (to New York) – route
Europe India Gateway (built in 2010 to connect the UK to Portugal, Gibraltar, Monaco, France, Libya, Egypt, Saudi Arabia, Djibouti, Oman, United Arab Emirates, and India at up to 3.84 Tbps) – route
Globalcom-1 (built in 2011, it connects the UK to Spain, Portugal, Morocco, Mauritania, Senegal, Ghana, and Nigeria at up to 2.5T bps) – route
Image above shows the cable landing station during its construction in December 2001.
Here are some pictures of the cable coming ashore.