![Image 1 — [Deep Sea Treasure Grand Adventure] Event Guide](https://preview.redd.it/8d7nr21ofs9h1.jpg?width=3840&format=pjpg&auto=webp&s=b2a8666a7b3c0bbff35071aecbd9c60281df1829)
![Image 2 — [Deep Sea Treasure Grand Adventure] Event Guide](https://preview.redd.it/k32dsx3ofs9h1.jpg?width=3840&format=pjpg&auto=webp&s=000e359e3302bb86db698234f4db05999e21be10)
![Image 3 — [Deep Sea Treasure Grand Adventure] Event Guide](https://preview.redd.it/62nlit5ofs9h1.jpg?width=3840&format=pjpg&auto=webp&s=05f6ce6184e139ee33b4f38ba46b88b1985ab620)
![Image 4 — [Deep Sea Treasure Grand Adventure] Event Guide](https://preview.redd.it/thv05t7ofs9h1.jpg?width=3840&format=pjpg&auto=webp&s=e274c2c63416521127ecb2aec23962b74a44d73a)
![Image 5 — [Deep Sea Treasure Grand Adventure] Event Guide](https://preview.redd.it/54eugs9ofs9h1.jpg?width=3840&format=pjpg&auto=webp&s=6d204470e3263e0f8093a65f02eee7ddb8135466)
[Deep Sea Treasure Grand Adventure] Event Guide
Once you get to Level 3 just start fully going into Deep Water to try to get Ether unlocked. Regardless you want to do Deep Water with Lancelot and Cherub once level 4 for their event mission.
Once you get the Sleeping Witch orb, you'll unlock Ether as an adventurer. She can get both Lancelot and Cherub items, and seems to target items not gotten in the catalog yet. So from there just alternate water areas until you finish your catalog.