What TC were you at when you got attacked?
Snorkelling at any TC higher than x32 is dangerous and you will die sooner rather than later. Usually by aircraft and by surprise. Period.
Historically snorkel boats seldom made over 70 nm per day when transiting while submerged. This is because the snorkel was generally used only to charge the batteries and air out the boat, not more than 4-6 hours in 24.
If you have the mast-mounted radar detectors from GWX you may still miss aircraft by visual means only. Use map contacts "ON" and zoom to the 5000 or 2500 metre scale on the nav screen. Ironically snorkelling in periods of good visibility is often safer than in fog, you may get more visual warning.
Never snorkel in the presence of a known enemy.
Snorkels and periscopes are fragile and easily damaged or destroyed and I have not found that having both scopes up is any better than just using one.
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