An oceanarium tunnel project is measured in years, not weeks, and most of the risk sits in one deliverable: the acrylic envelope that has to hold water perfectly the day the pumps start. In every such oceanarium tunnel project I have worked on, the same sequence decides success – casting the sections thick enough, machining them true, bonding the seams, and delivering an assembly method the site team can actually follow.
The casting and bonding sequence
Each tunnel section is cast as a cell cast acrylic tube or channel to the engineered wall thickness – often in the 100 mm class for a public tunnel – then the mating faces are machined square and parallel. Sections are bonded end to end with solvent polymerisation under controlled temperature, so the seam cures into the panel and reads as near-invisible. The complete run is then proofed against the water-load case before it is crated for site.
What arrives on site
For an oceanarium tunnel project RP River People delivers the cast sections, a full joining and assembly drawing, and the seal and frame guidance. The team installs in sequence, bonds the final site joints, and pressure-tests before the exhibit water is introduced. The client gets a tunnel built to engineering drawings rather than a pile of panels.
For the thickness and support logic behind these numbers, see our guide on large acrylic aquarium viewing panels and the joining detail in acrylic underwater tunnel sections.
Frequently Asked Questions
Q: How thick are public tunnel walls?
A: Public oceanarium tunnel walls are commonly engineered in the 100 mm class depending on depth and section span.
Q: Are seams visible?
A: Properly bonded seams cure into the panel and read as near-invisible, with the bond line rated for water load.
Q: Who handles the site joints?
A: RP River People provides the assembly drawing and final site bonding guidance so the installer completes the run to spec.
For a project-specific quotation on cast acrylic panels, email oversales@rpplexiglass.com with your opening size, water depth, support layout and drawing.