Photo by Teemu Virtanen · CC BY-SA 3.0
Decompression Procedures
Decompression Procedures is the foundational staged-decompression course: planning and running dives with a dedicated deco gas and mandatory stops, on open circuit, to a maximum depth of 45m/150ft over 4 dives. It teaches gas planning for a single decompression gas, in-water discipline for controlled ascents, and the contingency thinking a no-immediate-surfacing dive requires. It's for Advanced Nitrox divers ready to move from no-decompression technical diving into real staged decompression — the gateway course into TDI's deeper technical progression (Extended Range, Trimix, and most CCR decompression tracks all build on it). It's usually taken right after or alongside Advanced Nitrox, since the two share overlapping dive requirements.
Centres that teach this course
29 dive centres in the directory publish a price for this exact certification, checked Sep 2026. Each centre's own wording is shown beneath its name. Ranges cover whole-course prices only — where a centre charges per day or per dive, its rate is listed separately below, since a daily figure is not comparable with a course total.
- €680total
- €525total
- €500total
- €600total
- €450total
- €535total
- €520total
- €450total
- €510total
Charged by the day or dive rather than as a course price:
- €300per day
- $990total
- $1,500total
- $800total
- $800total
- $900total
Charged by the day or dive rather than as a course price:
- CDT Mexico (Cave Diving Training)MexicoDecompression Procedures1 student$300/day→ $900 for the 3-day minimum$300per day
- $325per day
- Cave AdventurersUnited StatesDecompression ProceduresPrivate class$450/day→ $900 for the 2-day minimumGroup class$350/day→ $700 for the 2-day minimum each$450per day
- Under The JungleMexicoDecompression Proceduresprivate$345/day→ $1,035 for the 3-day minimumper diver in a group$295/day→ $885 for the 3-day minimum each$345per day
- THB 29,500total
- Pattaya Scuba Club (by BB Marine)ThailandTDI Deco Procedures / IANTD Adv. Nitroxone price, several agenciesTHB 29,000total
- Krabi Scuba Club (by BB Marine)ThailandTDI Deco Procedures / IANTD Adv. Nitroxone price, several agenciesTHB 29,000total
- THB 29,000total
- Phuket Scuba Club (by BB Marine)ThailandTDI Deco Procedures / IANTD Adv. Nitroxone price, several agenciesTHB 29,000total
- IDR 9,500,000total
- IDR 7,900,000total
- IDR 10,000,000total
Charged by the day or dive rather than as a course price:
- Air Dive AlorIndonesiaDecompression Procedures1 student, privateIDR 3,200,000/day→ IDR 9,600,000 for the 3-day minimum3 studentsIDR 2,400,000/day→ IDR 7,200,000 for the 3-day minimum eachIDR 3,200,000per day
- ₱28,450total
Same training under a different agency
21 centres
A separate set of centres, teaching Advanced Nitrox / Decompression Procedures under a different agency. These are not the same certification — the standards and the card differ — but they cover the same depth and scope, which is why centres price them alike. Every row here names whose rating it is, and none of them is counted above.
- €500total
- €600total
- €600total
- €520total
- €475total
- €500total
- €520total
Charged by the day or dive rather than as a course price:
- €200per day
- €300per day
- $900total
Charged by the day or dive rather than as a course price:
- Elite Divers InternationalMexicoAdvanced Nitrox (Decompression Procedures) DiverIANTD$275/day→ $1,100 for the 4-day minimum$275per day
- Third Dimension DivingMexicoAdvanced Nitrox Diver (Decompression Procedures)IANTD$295/day→ $1,180 for the 4-day minimum$295per day
- $900per person
- $330per day
- ByMoMoDiveMexicoAdvanced Nitrox DiverIANTD1 student$245/day→ $980 for the 4-day minimum3 students$205/day→ $820 for the 4-day minimum each$245per day
- IDR 17,500,000total
- IDR 17,500,000total
- IDR 15,000,000total
- THB 24,000total
- THB 25,000total
- THB 24,000total
- MX$12,000total
Charged by the day or dive rather than as a course price:
- MX$5,000per day
- ₱32,950total
Same tier, agency not stated
16 centres
These centres publish a price for Advanced Nitrox / Decompression Procedures, but their own wording does not say which agency's certification it buys — many teach several and name the card only once you enquire, and some price one course for either agency. The figure is comparable; the certification is not identified, so we do not guess at one.
- $1,600total
- $600total
- $900total
- $600total
- $1,800total
- $1,000total
Charged by the day or dive rather than as a course price:
- CDT Mexico (Cave Diving Training)MexicoAdv. Nitrox + Deco Procedures (ANDP)1 student$300/day→ $1,500 for the 5-day minimum$300per day
- $400per day
- IDR 15,000,000total
- IDR 17,500,000total
- IDR 15,000,000total
- IDR 12,500,000total
- IDR 12,500,000total
- €425total
- €470total
- THB 35,000total
- ₱44,950total
These prices are not like-for-like. Two centres can charge very differently for the same certification because they include different things. One price may cover twinsets, stages, deco gas and cylinder rental for every training dive, a dedicated classroom for the theory, boat or transport to the site, and the agency's registration and materials; another may be tuition only, with all of that charged separately — or the other way round, with a centre bundling in extras the first leaves out. Class size, whether the course is one-to-one, and how many days are allowed for it move the figure too. Check what each centre's price includes before comparing them, and confirm with the centre before booking.
Consumables are usually extra. Sorb, helium, O₂ and other fills, park and cenote fees, certification fees and rental are commonly charged on top.
Packages combining several certifications, upgrades from an existing one, and open-ended day rates are excluded — none of them is the standalone price of this course, and including them would move the figures away from what a new student can actually book.
Prerequisites
TDI Advanced Nitrox Diver, plus SDI Advanced Adventure Diver or Advanced Diver; minimum 25 logged dives; minimum age 18.
Instructors Teaching This Course
Egypt
United States
Philippines
Mexico
Thailand
Malta
Indonesia
Dive Centres Offering This Course
Mexico
United States
Egypt
Philippines
Thailand
Indonesia
Malta
We're still building out the directory country by country, so this list isn't every instructor or dive centre teaching it in the world — more locations are coming soon.
Common questions about TDI Decompression Procedures
How much does TDI Decompression Procedures cost?
Published prices for TDI Decompression Procedures range across 23 centres in the TecDiveTools directory — roughly US$440 to US$1,500 at current exchange rates. In each centre's own currency: €450–€680 (9 centres), $800–$1,500 (5 centres), THB 29,000–29,500 (5 centres), IDR 7,900,000–10,000,000 (3 centres) and ₱28,450 (1 centre). 6 centres charge by the day instead, which is not comparable with a course total. Prices differ mainly in what they include, so compare the inclusions before comparing the numbers. Prices were last checked in September 2026.
How long does TDI Decompression Procedures take?
Between 2 and 5 days, based on the durations 17 centres publish for it. The time depends on the centre's schedule, weather, and how quickly the required skills are demonstrated — agencies set a minimum number of dives, not a fixed number of days.
What are the prerequisites for TDI Decompression Procedures?
TDI's standards require: TDI Advanced Nitrox Diver, plus SDI Advanced Adventure Diver or Advanced Diver; minimum 25 logged dives; minimum age 18.
What is the minimum age for TDI Decompression Procedures?
TDI's standards state: Minimum age 18.
How many dives do I need before starting TDI Decompression Procedures?
TDI's standards state: Minimum 25 logged dives.
What is the equivalent of TDI Decompression Procedures in other agencies?
At the same tier in TecDiveTools' cross-agency comparison: IANTD Advanced EANx Nitrox Diver, SSI XR Extended Range and PADI TecRec Tec 45. They cover comparable training, but each agency sets its own standards, depth limits and certification card, so they are comparable rather than interchangeable — check which one your next course accepts.
What course comes after TDI Decompression Procedures?
The next step in TDI's progression is TDI Extended Range.
Where can I take TDI Decompression Procedures?
209 dive centres and 432 instructors in the TecDiveTools directory teach TDI Decompression Procedures across 7 countries, most in the United States, Egypt, Mexico and the Philippines. Each is listed further up this page.
Does the price of TDI Decompression Procedures include gas and equipment?
Not always — it varies by centre. Certification fees, equipment rental and boat or site fees are commonly charged on top of the course price. Each centre's price list on TecDiveTools shows what it notes as included.