Mariner's Cave
Dive site · Tonga
Experienced divers only
Is it worth the trip?
66Good out of 100 for your dates
2 days tie for best
Mon 2 · 60 out of 100
- Sea
- 1.2 m
- Wind
- 21 kn
- Gusts
- 27kn
- Air
- 24°C
Tue 3 · 63 out of 100
- Sea
- 1.1 m
- Wind
- 18 kn
- Gusts
- 24kn
- Air
- 24°C
Wed 4 · 66 out of 100
- Sea
- 0.9 m
- Wind
- 16 kn
- Gusts
- 22kn
- Air
- 24°C
Thu 5 · 68 out of 100
- Sea
- 0.8 m
- Wind
- 13 kn
- Gusts
- 18kn
- Air
- 24°C
Fri 6 · 68 out of 100
- Sea
- 0.8 m
- Wind
- 15 kn
- Gusts
- 20kn
- Air
- 24°C
Sat 7 · 65 out of 100
- Sea
- 0.9 m
- Wind
- 18 kn
- Gusts
- 26kn
- Air
- 24°C
Sun 8 · 65 out of 100
- Sea
- 0.8 m
- Wind
- 17 kn
- Gusts
- 23kn
- Air
- 24°C
Tap a day for sea, wind and water. Full forecast
Forecast: next 10 days
Full forecast- Sun 162, good
- Mon 260, good
- Tue 363, good
- Wed 466, good
- Thu 568, good
- Fri 668, good
- Sat 765, good
- Sun 865, good
- Mon 965, good
- Tue 1063, good
The site in five facts
- Down to 12 mits deepest
- From a boathow you get in
- Experienced / deepexperienced divers only
- Water 27 °C3 mm wetsuit
- Faces Sswell from there reaches it
Full forecast
every day, every number
The score doesn't know currents, the visibility on the day or your certification.
Suits experienced divers only, as a dive guide states it. Scored for experienced divers.
| Day | Score | Sea | Wind | Gusts | Air |
|---|---|---|---|---|---|
| Sun 1Nov | 62, good | 0.9 m | 18 kn | 24kn | 25°C |
| Mon 2Nov | 60, good | 1.2 m | 21 kn | 27kn | 24°C |
| Tue 3Nov | 63, good | 1.1 m | 18 kn | 24kn | 24°C |
| Wed 4Nov | 66, good | 0.9 m | 16 kn | 22kn | 24°C |
| Thu 5Nov | 68, good | 0.8 m | 13 kn | 18kn | 24°C |
| Fri 6Nov | 68, good | 0.8 m | 15 kn | 20kn | 24°C |
| Sat 7Nov | 65, good | 0.9 m | 18 kn | 26kn | 24°C |
| Sun 8Nov | 65, good | 0.8 m | 17 kn | 23kn | 24°C |
| Mon 9Nov | 65, good | 0.8 m | 17 kn | 24kn | 25°C |
| Tue 10Nov | 63, good | 0.9 m | 18 kn | 26kn | 24°C |
Sea is the waves near the site, in metres; wind and gusts in knots. "Boats in": gusts that keep dive boats in. More
Tide
- Sun 1 NovLow 05:57 −0.6 mHigh 12:11 +0.5 mLow 18:16 −0.4 m
- Mon 2 NovHigh 00:27 +0.5 mLow 06:56 −0.5 mHigh 13:11 +0.5 mLow 19:21 −0.4 m
- Tue 3 NovHigh 01:29 +0.5 mLow 07:53 −0.5 mHigh 14:09 +0.5 mLow 20:23 −0.5 m
Local clock times; heights about mean sea level. On open coasts the times are usually within a quarter of an hour; in bays, estuaries and on the Gulf of Mexico they can be an hour or more out. Slack water, the safest time to dive where there is current, is about half an hour either side of each high and low. Tide: EOT20 global ocean tide model, Hart-Davis et al. 2021, DGFI-TUM (doi:10.17882/79489), CC BY 4.0. Times and heights computed by us. A model, not a tide table: check a local table before you go.
Forecast updated . It refreshes every three hours. Forecast data: ECMWF, DWD, Météo-France and NOAA, served by Open-Meteo.com (CC BY 4.0). Changed by us. Generated using E.U. Copernicus Marine Service Information.
Map
the site and its town
Mariner's Cave on Google Maps · Directions
Each place wears its best day on these dates: green good, amber fair, pale red poor, as the key says.
The map needs JavaScript. Every place on it is listed on this page, and each place's page links to Google Maps.
One finger scrolls the page; two fingers move the map. Pins are our own positions. Map OpenFreeMap, © OpenMapTiles, data © OpenStreetMap contributors.
More diving near here
5 places
- Clan McWilliam Wreck 2 km away
- Swallows Cave 2.1 km away
- The Ledge Vavau 2.8 km away
- The Coral Garden Vavau 3.3 km away
- Humpback Wall 5 km away
About
the place in full, sources, credits
About Mariner's Cave
A cave dive. It goes down to 12 m. You get in from a boat. It suits experienced divers only, as a dive guide states it. The coast faces S: swell from the S reaches it, and wind from the N blows out to sea. 1 dive centre or shop within 10 km, the nearest 5.9 km away. The sea is about 26°C in July, its coldest month (3 mm wetsuit), and 29°C in January, its warmest (rash vest or 1 to 2 mm). The town to stay in is Neiafu. Within 5 km we also list 5 dive sites.
- What it is Cave.
- How deep Down to 12 m.
- Getting in From a boat.
- Who it suits Suits experienced divers only, as a dive guide states it.
- Dive centres 1 dive centre or shop within 10 km, the nearest 5.9 km away.
Water about 27°C: 3 mm wetsuit. Typical sea temperature for the time of year, not a forecast.
The score is the conditions only: the journey, the price and the partners never change it (how we score, how we earn).
Where to stay: Neiafu
10 min by car · 12 places to stay
About Neiafu its beds, food and every spot near it
Drives are estimates. Prices are about, in US Dollar (USD): our pound figures at the European Central Bank's rate of 30 October 2026.
In the water
Dives and courses in Neiafu · GetYourGuideDive gear hire in Neiafu · GetYourGuide
Dive centres nearby
Beluga Diving 5.9 km
The nearest named dive centres and shops within 25 km, in a straight line; training agencies where the map states them. Listings, not a recommendation. Dive centres: © OpenStreetMap contributors (ODbL). Credits
What you might see
Animals divers and surveys have recorded within 2 km of this site in the last 15 years. A record says someone saw it here, not that you will.
Pomacentrus vaiuli
Seen in 110 records, mostly Jul to Sep.
Dascyllus aruanus
Seen in 101 records, mostly Jul.
Burnt Parrotfish Chlorurus sordidus
Seen in 97 records, mostly Jul to Sep.
Lined Bristletooth Ctenochaetus striatus
Seen in 83 records, mostly Sep.
Banded Goatfish Parupeneus multifasciatus
Seen in 79 records, mostly Jul.
Halfmoon triggerfish Sufflamen chrysopterum
Seen in 79 records, mostly Jul.
Schlegel's Parrotfish Scarus schlegeli
Seen in 69 records, mostly Jul to Sep.
Pomacentrus maafu
Seen in 67 records, mostly Jul.
Bleeker's Parrotfish Chlorurus bleekeri
Seen in 58 records, mostly Jul.
Dascyllus reticulatus
Seen in 49 records, mostly Jul.
Scarus rivulatus
Seen in 46 records, mostly Jul to Sep.
Merten's Coralfish Chaetodon mertensii
Seen in 44 records, mostly Jul to Sep.
Records: OBIS (Ocean Biodiversity Information System, IOC-UNESCO), from the datasets named here, CC0 and CC BY records only. Names: WoRMS, through OBIS; common names from Wikidata. Largest datasets here: Tonga Reef survey data 2016-2018. Credits
What is under the water this week (visibility, current) no free forecast gives. Ask a dive centre before you book.