Find out the benefits of achieving a good buoyancy control.

Managing your trim can play a significant role in diving safely

Improve your skills while having fun with our all-new online Competition

Dive following the suggested plan and upload your dive profile on
Enter the competition and
share your performances with the dive community

Be the Master and put your hands on a number of fantastic prizes

Good trim is the ability to be neutrally buoyant and maintain a stable, horizontal position buoyancy control.

It is a prerequisite for a number of underwater pursuits, and mastering it may result in experiencing less fatigue, reduce gas consumption, learn new skills more easily, safeguard the environment and benefit from improved confidence and control. We would like to raise awareness about the benefits of good bouyancy through a new, exciting challenge: the MasterTrim contest.We would like to raise awareness about the benefits of good bouyancy through a new, exciting challenge: the MasterTrim contest.

This game is bulit with the support of Green Bubbles Project

Green Bubbles is an EU research project managed by a consortium of nine academic and non-academic entities in six countries (Italy, The Netherlands, Malta, Turkey, South Africa, USA). These bring expertise from disciplines including social science, environmental science, IT and computer science, medicine and engineering. Launched in 2015 and with a four-year lifespan, Green Bubbles aims to maximise the benefits associated with SCUBA diving, whilst also minimising its negative impacts. The ultimate goal is to promote the sustainability of the scuba diving industry.

The ultimate outcome of the project is expected to be the development and implementation of a new and holistic quality label for sustainable diving operations.

Green Bubbles has received funding from the EU's H2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement N° 643712.


  • Participation in the competition is free of charge.
  • To participate, just log into the Diver Safety Guardian logbook using your DAN ID. If you don't have one, register here to get your DAN ID.
  • The competition is open to all certified SCUBA divers. Each participant must dive following the safety rules set by the agency which issued their certificate.
  • Participation in the competition is only possible with a dive computer compatible with DAN DL7 format, ZXU DAN Level 1, ZXL DAN Level 3, UDDF with sampling rate from 1 to 10 seconds.
  • The participant is responsible for the correct date and time setting of his/her dive computer.
  • The participant is responsible for the correct setting of fresh/salt water in his/her computer.
  • The participant must use an open circuit SCUBA and must wear the dive computer on the wrist or on the consol.
  • The participant must not use a line, rope or anchor chain to assist the buoyancy.
  • The participant must not cling on anything or sit on the sea bottom.
  • The participant must not make any change in the dive profile file recorded by the dive computer during the dive.
  • The participant must not be involved in the set-up of the competition or belong to one of the Organisations who built the game.
  • The dives can be performed on inland lakes or sea water as well as accredited artifcial pools (Nemo33 and Y40).
  • Solo diving is NOT allowed. The dive must be logged in a conventional paper logbook, and must be signed by the diving buddy. The contact details (phone and email) of the diving buddy on the paper logbook must be written as well.
  • Divers can participate in any round of the competition, whilst the winners of any of the 4 rounds are NOT allowed to participate in the following rounds.
  • The diver can upload his/her dive profile no more than five times.
  • Since the ranking is build as penalty points, winners of preliminary rounds and final will be those who score the least points.
  • The equipment of Y-40 can be used at NOCOST (subject to availability), but It is strongly recommended that participants use their own equipment.


  • 14th April – 2nd May at 18:00 // 1st round
  • 19th May – 13th June at 18:00 // 2nd round
  • 14th July – 1st August at 18:00 // 3rd round
  • 1st September – 26th September at 18:00 // 3rd round

Final competition

Divers adimitted: 12
Date: 21st October
Location: Y-40 The Deep Joy