Swim in the sea. So it is a bit like

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swim in the sea. So it is a bit like Mount Everest

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“But the distance across the Channel is about as far as it is possible for someone to swim in the sea. So it is a bit like Mount Everest – it is the big challenge, the final goal, for people who are keen on long-distance swimming.”

The Channel for swimmers is (a little) like Mount Everest for mountaineers.
For people who are keen on swimming, the Channel is the big challenge, the final goal. For people who are keen on mountain climbing, Mount Everest occupies the same position.

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I think so ; much training doing this feat .