 Japanese title card · “Aim for It! The Sunken Ship in the Southern Sea” | |
| Series | Sonic X (ソニックX), TMS Entertainment |
| Season | Season 1 (2003–2004) |
| Episode | Season 1, episode 16 · no. 16 of 78 |
| English title | “Depths of Danger” (4Kids) |
| Japanese title | 目指せ！南海の沈没船 (Mezase! Nankai no Chinbotsusen, “Aim for It! The Sunken Ship in the Southern Sea”) |
| First aired (Japan) | 20 July 2003 · TV Tokyo |
| First aired (US) | 17 January 2004 · Fox Box (Fox) |
| Directed by | Masafumi Satō |
| Written by | Chinatsu Hōjō |
| Storyboard | Masafumi Satō |
| Previous episode | Skirmish in the Sky (S01E15) |
| Next episode | The Adventures of Knuckles and Hawk (S01E17) |
HolidaySunken treasure
Depths of Danger is episode 16 of Season 1 of Sonic X and the 16th of the anime’s 78 episodes. In Japan it is called “Aim for It! The Sunken Ship in the Southern Sea” (目指せ！南海の沈没船). It premiered on TV Tokyo on 20 July 2003, and the 4Kids English version followed on Fox Box (Fox) on 17 January 2004. It was directed by Masafumi Satō and written by Chinatsu Hōjō.
Synopsis
Eggman is lying low – quite literally, hiding on the sea bed in his damaged Egg Fort while the President’s search parties pass overhead. The heroes, meanwhile, are made official: the government sends passports and Social Security numbers for everyone, plus a stack of licences so Tails can fly anywhere, though Amy hates her passport photo.
They celebrate with a trip to the Sapphire Sea, where the X-Tornado senses a Chaos Emerald under the water and fans mob them for autographs. Hiring diving gear and a boat, they hear a local legend about a ship that sank with its treasure, and on the sea floor they find the wreck – where a troublesome crab turns out to be guarding the blue Emerald.
Eggman’s robot Clurken has other ideas. Underwater, the drag robs Sonic of his speed, and the robot hauls him up in its tentacles until Sam Speed roars in on a jet ski and Tails throws a Ring. Clurken is destroyed, but the wreck ends up buried under rocks. The dive-shop owner doesn’t mind: the legend was true, and the ship was his grandfather’s.
Key Moments
- Sonic and friends get passports and Social Security numbers; Tails gets a pilot’s licence.
- The blue Chaos Emerald is found in a sunken ship.
- Sam Speed helps Sonic against Eggman’s sea robot.
Trivia
- 4Kids aired it on 17 January 2004, after a five-week holiday break in the Fox Box run.
- On home video: Japanese DVD/VHS volume 4 (Victor Entertainment, 22 October 2003); 4Kids/FUNimation volume 4, Beating Eggman (7 December 2004); the Chaos Emerald Chaos DVD set (2008); and Discotek’s Sonic X Collection 1 (2016) and complete-series Blu-rays.
Watch the Episode
The full 4Kids English episode, uploaded by TMS Entertainment’s official “Anime! on TMS” YouTube channel (checked 6 November 2026).
Part of our Sonic X Season 1 guide. See the Sonic X series page for the cast, theme songs and home video.
Sources: titles, credits and air dates from Wikipedia’s list of Sonic X episodes and Sonic Wiki Zone, cross-checked with each other and with Luke’s original Sonic Scene episode table; synopsis written for Sonic Scene from the episode, Wikipedia’s summary and Sonic Wiki Zone’s plot notes; title card and screenshots via Sonic Wiki Zone, copied to our media library.