"A terrorist or foreign agent would have been free to plant explosives ..."
"A terrorist or foreign agent would have been free to plant explosives or force their way inside," reported the paper."
Typical Mail. Someone with explosives would be pretty free to plant them anywhere.
If a foreign agent or terrorist wanted to sabotage the link, a locked door wouldn't be any deterrent.
No, by forgetting to lock the doors, the site was simply only made vulnerable to local petty theives and vandals, but that doesn't make a sexy headline, does it?