Here in London, it’s less than 100 days to go until the Olympic juggernaut steams into town, bringing a trail of disruption in its wake. As many as 11 million people are expected to visit the Games during the two weeks following the opening ceremony on July 27. For those of us who live and work in the bustling English capital, it’s a terrifying prospect. For London’s largest law firm offices, it raises serious issues surrounding staff travel, logistics, and security.

As any Londoner will attest, our much-maligned public transport system is already heaving under the strain of the city’s 7.5 million permanent inhabitants. Traveling around central London during rush hour on an ordinary working day is a grueling exercise in pain and futility. Add the 3 million additional journeys that are expected to be made each day during the Olympics, and the results don’t even bear thinking about.

Transport for London, the government body that runs the majority of public transport in the city, has spent around £6.5 billion on upgrades in an attempt to avoid a travel meltdown. Despite this, TfL recently released details of no fewer than 88 travel “hotspots”—areas that will either be “busier than usual” or “exceptionally busy” during the Games.

I’m afraid it’s bad news for Big Law: Almost all of the stations around which major law firm offices are centered—such as Bank, Chancery Lane, St Paul’s, London Bridge, and Canary Wharf—are designated in the most severe category, meaning waits of more than 30 minutes for those trying to board trains. Significant delays are also expected on the Jubilee and Central underground lines, and the Docklands Light Railway, which each provide vital infrastructure links across a number of London’s key business districts.

“We’ve been preparing for this for nearly two years,” says George Pantelides, operations manager at Skadden, Arps, Slate, Meagher & Flom. “Because of our size and location in Canary Wharf, we potentially face the greatest challenges of any U.S. firms in London. Lots of people believe you can just arrange for more home-working and you’ll be fine, but it’s not that simple. There are lots of individual problems that firms need to solve in a way that works cohesively. It’s a massive challenge.”