Sixty ways to cross the Thames: on foot, under the riverbed, is also possible

How long does it take to cross the Thames on foot? It seems impossible to walk on water, right, but there are approximate ways to calculate it. And how many different ways must one get from one bank of the river to the other within the limits of Greater London? As of this Sunday, April 6, officially 59, including the ferry, the cable car, a tunnel exclusively for road traffic, public transport, and, of course, using the 25 bridges that connect the north and south of the city: bridges for all types of vehicles, bridges for the Underground, the railway, and the Overground.