I couldn't jump them either. The artifact is not there, so that's why you didn't get it. Swim back over. If you are looking for the artifact, then the Lich obviously has given you the quest. There is a key he also gave you that opens a door - that door is almost directly under the entrance hall (ie between the 2 sets of stairs that lead down from the first castle chamber. There are several puzzles to go, but the artifact and Adrianna's scroll and Mabba Mabbig are all down there.
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