Who This Dive Is For — And Why Futo Breaks the Izu Mold

Most visitors to the Izu Peninsula funnel into the sandy, beginner-friendly shore entries around Izu-Kogen or the calm cove at Futomi, but Futo Rocky Point is a different animal entirely. This is a boat dive built around a single dramatic feature: a granite pinnacle rising from roughly 28 meters to within 5 meters of the surface, wrapped in a thick skirt of kajime kelp and Sargassum that sways with the current like a slow-motion forest. It suits certified divers — Open Water with at least a handful of logged dives is the realistic minimum, and Advanced Open Water or a drift-diving specialty is strongly preferred — because the site regularly runs a current of 0.5 to 1.5 knots along the pinnacle's eastern face.

What makes it distinct from the rest of the Izu dive circuit is the combination of structure and biomass. The pinnacle itself is riddled with swim-throughs and overhangs that shelter moray eels, Japanese spiny lobster, and the occasional wobbegong-like banded houndshark resting on the sand at the base. Above the rock, the kelp canopy hosts juvenile yellowtail, striped knifejaw (ishidai), and in late summer, dense schools of Japanese jack mackerel that wheel around the top of the structure in a silver curtain. Photographers come for the wide-angle kelp-and-light shots in the shallows; critter hunters drop to the base of the pinnacle for nudibranchs and flatworms tucked into the rock crevices. It is not a site for a first open-water checkout dive, but for anyone with 15-plus dives under their belt, it's one of the more memorable single-tank experiences on the eastern Izu coast.

Conditions: Entry Points, the Kelp Line, and the Pinnacle Wall

Dives here launch by boat from Futo Fishing Port, a 5-minute harbor crossing to the site itself, which sits roughly 400 meters offshore. Boats typically run two-tank mornings, with the first splash around 8:30am to catch slack tide. Briefings matter more at Futo than at most Izu sites because the dive plan genuinely changes with the current direction — guides will point out whether you're running a drift along the north wall or a there-and-back loop around the pinnacle's sheltered south side.

A typical profile: descend the mooring line to around 12 meters, where the kelp canopy begins in earnest between May and November. The kajime stands thin out below 18 meters, giving way to bare granite scattered with gorgonian fans and black coral whips down to a sandy base around 26 to 30 meters. The signature swim-through sits at about 16 meters, a 6-meter rock tunnel wide enough for two divers side by side, opening onto a small sandy amphitheater where guides often find resting houndsharks. Visibility ranges from a murky 5 meters after heavy rain runoff to a crisp 15 to 18 meters on good days in autumn, when the Kuroshio Current pushes warmer, clearer offshore water onto the coast.

Water temperature swings widely by season: around 15 to 17°C in February and March, climbing to 24 to 27°C from August through early October. A 5mm wetsuit with a hood is the practical minimum outside summer; a drysuit is common among local shop staff from December through April. Because of the current, dive computers and a surface marker buoy are mandatory at every shop operating here — if you drift past the planned ascent point, you deploy the SMB and the boat picks you up, rather than fighting back to the mooring line.

Season and Access: When to Go and How to Get to Futo

The dive season at Futo Rocky Point runs essentially year-round, but the window that balances warm water, strong kelp growth, and good visibility is late June through early November. July and August bring the warmest water (25 to 27°C) and the best schooling-fish action, but also the most crowded boats and higher jellyfish presence near the surface. September and October are the sweet spot locally recommended by Ito-area shops: water still in the mid-20s, visibility improved by the retreating rainy-season runoff, and the kelp forest at its fullest before it begins to die back in winter. Winter diving (December through March) trades warmth for clarity and solitude — fewer boats, colder water, but some of the best long-range visibility of the year on clear, low-current days.

Getting there from Tokyo is straightforward by train: take the JR Odoriko limited express from Tokyo Station directly to Ito Station, a ride of about 1 hour 45 minutes to 2 hours depending on the service. From Ito Station, Futo Port is roughly a 15-minute taxi ride (around 2,000 to 2,500 yen) or a local Tokai Bus connection; most dive shops that run the Futo boat also offer a paid pickup from Ito Station if arranged in advance, typically for 1,000 to 1,500 yen round trip. By car, the drive from central Tokyo via the Tomei Expressway and Izu Skyline toll road takes about 2 to 2.5 hours depending on traffic, with free parking available at most shop bases near the port. If you're coming from the Kansai side, Shizuoka Airport is roughly 90 minutes from Ito by a combination of airport limousine bus and the JR Ito Line, making it a viable alternative to flying into Haneda or Narita and training down. Atami, one stop before Ito on the Tokaido Shinkansen, is the fastest rail gateway if you're short on time — from Atami it's a quick 15-minute local train transfer to Ito.

Practical Tips: Booking, Gear, Etiquette, and Fueling Up Afterward

Book through one of the Ito-area dive operators that run the Futo boat specifically — not every Izu shop services this site, since it requires its own harbor permit and boat slot, so confirm "Futo Rocky Point" by name when reserving rather than assuming it's included in a generic Izu package. Two-tank boat trips typically run 14,000 to 18,000 yen including tanks and weights, with full gear rental adding another 5,000 to 7,000 yen if you're not bringing your own. Reserve at least 3 to 5 days ahead during the July-to-September peak; weekday slots in shoulder season (May, June, October, November) can often be booked 1 to 2 days out.

Bring certification card and logbook — shops here do check experience level before confirming the Futo boat, since the current profile isn't appropriate for brand-new divers. A surface marker buoy and whistle or safety sausage are generally required gear, and most shops rent these for a small additional fee if you don't own one. A dive computer is effectively mandatory given the depth range and current; a few shops still offer rental computers for around 1,500 yen per day but supply is limited, so confirm availability when booking.

Etiquette on the boat matters: current dives mean strict buddy checks and a firm no-solo-drift policy, and guides expect divers to stick to the briefed ascent signal rather than freelancing around the pinnacle. Respect the kelp forest itself — it's a slow-growing, ecologically important habitat, and fin contact or grabbing kelp fronds for stability is discouraged; use proper buoyancy instead. Touching or collecting marine life, including the lobster and shells common on the rock, is not permitted.

For food and lodging after the dive, Futo and nearby Ito town have a solid lineup of seafood restaurants serving same-day catch — look for kinmedai (golden eye snapper) set meals, an Ito specialty, widely available for 2,000 to 3,500 yen at harbor-adjacent restaurants. Several small minshuku guesthouses and business hotels cluster around Ito Station for divers doing a weekend of multiple boat days, generally running 6,000 to 12,000 yen per night. If you're driving back toward Tokyo the same day, the public footbath and hot spring facilities around Ito make a good rinse-and-relax stop before the 2-hour drive home.