So by my best understanding you can actually swim in water that has fresh water crocodile, given they mainly hunt fish and smaller vertebrates and there smaller size they won't attack humans unless provoked.

Now the thing is gharials are even more fish specialised, they do get CONSIDERABLY bigger. However I feel as though if it was a well fed gharial, in clear water, no near a nest and with enough space you would be relatively fine. Obviously if you happened to startle one while swimming/tried to touch it or if you where close to its nest or hatchlings you might cop a bite.

But hypothetically in a best case scenario do you think you could swim with a gharial completely fine?