--- title: "Underwater Odyssey case on CSGOBig: odds, RTP & drops" description: "Underwater Odyssey ($5.00) on CSGOBig, a CS2 case site: advertised RTP 89.99% from 12 items with odds, observed 97.38% over 24 openings in 30 days." url: https://gambatracker.com/cases/csgobig/190 rendered: 2026-11-11T13:24Z --- [Case sites](https://gambatracker.com/case-sites) / [CSGOBig](https://gambatracker.com/case-sites/csgobig) / [Underwater Odyssey](https://gambatracker.com/cases/csgobig/190) # [CSGOBig](https://gambatracker.com/case-sites/csgobig) · Underwater Odyssey A case on CSGOBig, first seen 3 Nov 2026. Every value is CSGOBig's own item price converted from csgobig coin at the rate on the site page. [24h](https://gambatracker.com/cases/csgobig/190?window=24h) [7d](https://gambatracker.com/cases/csgobig/190?window=7d) [30d](https://gambatracker.com/cases/csgobig/190) [All](https://gambatracker.com/cases/csgobig/190?window=all) Price · $5.00 · 5 CSGOBIG\_COIN Advertised RTP · 89.99% · EV $4.50 from 12 items Observed RTP, 30d · 97.38% · 24 openings, odds method Variance · 152.3× · of price², per opening Tail share · 18.2% · of openings carry half the EV Below price · 72.7% · of openings return less than the price ## Advertised vs observed · per window, 95% band and the advertised marker observed, 95% band advertised outside band small sample 24 hours · 11 openings · below min 7 days · 22 openings · below min 30 days · 24 openings · below min since tracking started · 24 openings · below min -0.5% 387.5% 775.5% **Small sample.** 24 openings and 4.4 expected rare hits: below the 100 openings and 5 hits the test needs, so no verdict. ## Windows · the test per window | Window | Openings | Observed | Dev. | Method | | --- | --- | --- | --- | --- | | [24h](https://gambatracker.com/cases/csgobig/190?window=24h) | 11 | 45.64% ±729.4 | — | odds | | [7d](https://gambatracker.com/cases/csgobig/190?window=7d) | 22 | 86.24% ±515.7 | — | odds | | [30d](https://gambatracker.com/cases/csgobig/190) | 24 | 97.38% ±493.8 | — | odds | | [All](https://gambatracker.com/cases/csgobig/190?window=all) | 24 | 97.38% ±493.8 | — | odds | Enough sample: 100 openings and 5 expected rare hits (odds method) or 1,000 openings (sample method). ## Items, odds and values · 12 items · odds sum to 1 · observed counts over 24 openings, 30 days Share of the expected value, most valuable first; colour is the item's rarity. | Item | Odds | Value | EV share | Observed | Expected | Hot / cold | | --- | --- | --- | --- | --- | --- | --- | | [★ Bayonet \| Gamma Doppler (Factory New) (Emerald) knife · covert · Emerald](https://gambatracker.com/items/bayonet-gamma-doppler-factory-new-emerald) | 1 in 10,000 | $6,132 6,132 CSGOBIG\_COIN | 13.6% | 0 | 0.0 | — | | [StatTrak™ P250 \| Undertow (Factory New) StatTrak · weapon · Legendary](https://gambatracker.com/items/stattrak-p250-undertow-factory-new) | 1 in 64 | $50.00 50 CSGOBIG\_COIN | 17.3% | 0 | 0.4 | — | | [Souvenir SG 553 \| Waves Perforated (Battle-Scarred) Souvenir · weapon · #B0C3D9](https://gambatracker.com/items/souvenir-sg-553-waves-perforated-battle-scarred) | 16.6% | $11.00 11 CSGOBIG\_COIN | 40.6% | 9 | 4.0 | 2.26× | | [StatTrak™ MP7 \| Ocean Foam (Minimal Wear) StatTrak · weapon · #8847ff](https://gambatracker.com/items/stattrak-mp7-ocean-foam-minimal-wear) | 1 in 11 | $10.00 10 CSGOBIG\_COIN | 20.2% | 1 | 2.2 | 0.46× | | [Souvenir Glock-18 \| High Beam (Factory New) Souvenir · weapon · Industrial](https://gambatracker.com/items/souvenir-glock-18-high-beam-factory-new) | 1 in 33 | $2.97 2.97 CSGOBIG\_COIN | 2.0% | 1 | 0.7 | — | | [StatTrak™ P250 \| Ripple (Factory New) StatTrak · weapon · mil spec](https://gambatracker.com/items/stattrak-p250-ripple-factory-new) | 1 in 16 | $0.75 0.75 CSGOBIG\_COIN | 1.0% | 0 | 1.5 | 0.00× | | [StatTrak™ P2000 \| Oceanic (Well-Worn) StatTrak · weapon · Mil Spec Grade](https://gambatracker.com/items/stattrak-p2000-oceanic-well-worn) | 13.6% | $0.63 0.63 CSGOBIG\_COIN | 1.9% | 3 | 3.3 | 0.92× | | [StatTrak™ P250 \| Ripple (Minimal Wear) StatTrak · weapon · milspec](https://gambatracker.com/items/stattrak-p250-ripple-minimal-wear) | 12.1% | $0.46 0.46 CSGOBIG\_COIN | 1.2% | 3 | 2.9 | 1.03× | | [MP7 \| Cirrus (Well-Worn) weapon · milspec](https://gambatracker.com/items/mp7-cirrus-well-worn) | 10.6% | $0.30 0.3 CSGOBIG\_COIN | 0.7% | 2 | 2.5 | 0.79× | | [MAC-10 \| Oceanic (Well-Worn) weapon · milspec](https://gambatracker.com/items/mac-10-oceanic-well-worn) | 1 in 22 | $0.29 0.29 CSGOBIG\_COIN | 0.3% | 0 | 1.1 | 0.00× | | [P2000 \| Oceanic (Factory New) weapon · mil spec](https://gambatracker.com/items/p2000-oceanic-factory-new) | 15.1% | $0.24 0.24 CSGOBIG\_COIN | 0.8% | 3 | 3.6 | 0.83× | | [MAC-10 \| Oceanic (Battle-Scarred) weapon · #4b69ff](https://gambatracker.com/items/mac-10-oceanic-battle-scarred) | 1 in 13 | $0.15 0.15 CSGOBIG\_COIN | 0.3% | 2 | 1.8 | 1.10× | Values are CSGOBig's own item prices; EV share = odds × value ÷ EV. Hot / cold compares observed drops of each item with odds × openings; small expected counts are left blank. Odds read from `csgobig:api/cases/getDetails?id=190`, 11 Nov, 13:05 UTC. ## Biggest drops · from this case, by value **No drops yet** No drop from this case seen yet. ## Latest drops · newest first [All Latest drops →](https://gambatracker.com/drops?casino=csgobig&case=190) [MAC-10 | Oceanic (Battle-Scarred) weapon · #4b69ff](https://gambatracker.com/items/mac-10-oceanic-battle-scarred) Hidden $5.00 5 CSGOBIG\_COIN $0.15 0.15 CSGOBIG\_COIN 0.03x 2026-11-11 06:39 UTC [MAC-10 | Oceanic (Battle-Scarred) weapon · #4b69ff](https://gambatracker.com/items/mac-10-oceanic-battle-scarred) Hidden $5.00 5 CSGOBIG\_COIN $0.15 0.15 CSGOBIG\_COIN 0.03x 2026-11-11 06:39 UTC [StatTrak™ P250 | Ripple (Minimal Wear) StatTrak · weapon · milspec](https://gambatracker.com/items/stattrak-p250-ripple-minimal-wear) Hidden $5.00 5 CSGOBIG\_COIN $0.46 0.46 CSGOBIG\_COIN 0.09x 2026-11-11 06:39 UTC [StatTrak™ P2000 | Oceanic (Well-Worn) StatTrak · weapon · Mil Spec Grade](https://gambatracker.com/items/stattrak-p2000-oceanic-well-worn) Hidden $5.00 5 CSGOBIG\_COIN $0.63 0.63 CSGOBIG\_COIN 0.13x 2026-11-11 02:38 UTC [P2000 | Oceanic (Factory New) weapon · mil spec](https://gambatracker.com/items/p2000-oceanic-factory-new) Hidden $5.00 5 CSGOBIG\_COIN $0.24 0.24 CSGOBIG\_COIN 0.05x 2026-11-11 02:38 UTC [Souvenir SG 553 | Waves Perforated (Battle-Scarred) Souvenir · weapon · #B0C3D9](https://gambatracker.com/items/souvenir-sg-553-waves-perforated-battle-scarred) Hidden $5.00 5 CSGOBIG\_COIN $11.00 11 CSGOBIG\_COIN 2.20x 2026-11-11 01:19 UTC [P2000 | Oceanic (Factory New) weapon · mil spec](https://gambatracker.com/items/p2000-oceanic-factory-new) Hidden $5.00 5 CSGOBIG\_COIN $0.24 0.24 CSGOBIG\_COIN 0.05x 2026-11-11 01:19 UTC [StatTrak™ P2000 | Oceanic (Well-Worn) StatTrak · weapon · Mil Spec Grade](https://gambatracker.com/items/stattrak-p2000-oceanic-well-worn) Hidden $5.00 5 CSGOBIG\_COIN $0.63 0.63 CSGOBIG\_COIN 0.13x 2026-11-11 01:19 UTC [Souvenir SG 553 | Waves Perforated (Battle-Scarred) Souvenir · weapon · #B0C3D9](https://gambatracker.com/items/souvenir-sg-553-waves-perforated-battle-scarred) Hidden $5.00 5 CSGOBIG\_COIN $11.00 11 CSGOBIG\_COIN 2.20x 2026-11-11 01:19 UTC [MP7 | Cirrus (Well-Worn) weapon · milspec](https://gambatracker.com/items/mp7-cirrus-well-worn) Hidden $5.00 5 CSGOBIG\_COIN $0.30 0.3 CSGOBIG\_COIN 0.06x 2026-11-11 01:19 UTC ## Catalog changes · price, advertised RTP and contents, per capture | Captured | Price | Advertised | Items | | --- | --- | --- | --- | | 3 Nov, 04:27 UTC | $5.00 | 89.99% | 12 | Each opening is tested against the capture in force when it happened; a price or odds change starts a new one. listed covert 0.0% Legendary 1.6% #B0C3D9 16.6% #8847ff 9.1% Industrial 3.1% mil spec 21.2% Mil Spec Grade 13.6% milspec 27.3% #4b69ff 7.6% best hit — 18+ **Case opening is gambling with skins as the currency.** At 90.0% RTP, every $100 put into cases returns $89.99 on average: an expected loss of $10.01 per $100, before any one lucky or unlucky opening. A big drop here says nothing about the next one. [BeGambleAware](https://www.begambleaware.org/) [Help & limits](https://gambatracker.com/responsible-gambling) How these figures are produced and labelled: https://gambatracker.com/llms.txt