# as they sailed

"as they went"

# fell asleep

"began to sleep"

# A terrible windstorm came down

"A storm of very strong winds began" or "Very strong winds suddenly began to blow"

# their boat was filling with water

The strong winds caused high waves which pushed water over the sides of the boat. This can be stated clearly. Alternate translation: "the winds caused high waves that started to fill up their boat with water" (See: [[rc://en/ta/man/jit/figs-explicit]])