Tectona grandis
The Story of a Teak Beam: From Burmese Forest to Bethnal Green
Displayed here is the end section of a teak baulk – a roughly squared timber beam – whose journey spans more than two centuries, two continents and a period of profound global change.
The tree from which this beam was cut grew in the forests of Myanmar, then Burma, during the nineteenth century. Harvested in the early twentieth century, it formed part of a cargo of Burmese teak loaded onto the SS Pegu in Rangoon (now Yangon) in 1917. Bound for Liverpool during the First World War, the vessel never completed its journey. On 8 July 1917, the SS Pegu was torpedoed by the German submarine U-57 off the coast of Ireland, approximately seven miles south-east of Galley Head, and sank with its cargo to a depth of around 80 metres beneath the Atlantic.
For almost a century the timber remained on the seabed. Then, in 2011, working from German naval records, a salvage team located the wreck and recovered approximately 80 tonnes of teak. Remarkably, much of the timber was found to be in excellent condition. Protected by layers of silt and deprived of oxygen, the wood had survived decades beneath the sea with its structural integrity largely intact.
The beam shown here tells part of that story. While most of the timber was exceptionally well preserved, the exposed end had become home to marine borers known as gribble worms (Limnoriidae), small crustaceans that tunnel through submerged wood. The distinctive cavities visible in the timber record nearly a century of interaction between material and marine ecology.
The remainder of this baulk was incorporated into the construction of Arboreal Architecture's Bethnal Green Memorial project, extending the life of a material that has already witnessed extraordinary histories of landscape, trade, conflict and recovery.
Teak and the Global Timber Trade
Teak (Tectona grandis) has long been one of the world's most valued hardwoods. Native to South and Southeast Asia, including Myanmar, India, Thailand and Laos, it is renowned for its strength, dimensional stability and natural resistance to moisture, insects and decay. These characteristics made it indispensable to shipbuilding, architecture and infrastructure throughout the colonial era.
By the nineteenth century, Burmese teak had become a globally traded material. Vast quantities were exported through the port of Rangoon to supply naval dockyards, railway networks, bridges and public buildings across the British Empire. Teak's durability in harsh environments made it particularly valuable for maritime applications, where exposure to saltwater and changing climates demanded exceptional performance.
The history of teak is therefore inseparable from the history of global trade, colonial extraction and industrial expansion. Materials such as this beam reveal the extensive networks that connected forests in Southeast Asia with shipyards, cities and military infrastructure thousands of miles away.
A Material with Ecological Significance
Beyond its cultural and economic history, teak is also an important ecological species. Mature trees can reach heights of 30 to 40 metres and play a significant role within tropical deciduous forests. Their canopies provide habitat for birds, insects and mammals, while their root systems help stabilise soils and reduce erosion.
As a relatively fast-growing hardwood, teak also acts as a substantial carbon store throughout its lifetime. However, increasing global demand has contributed to the depletion of natural teak forests in parts of its native range. While plantation forestry now supplies much of the world's teak, these monocultures often support far lower levels of biodiversity than natural forests.
Basic Information Tectona Grandis
Tectona grandis, commonly known as teak, is a large deciduous tree native to south and southeast Asia, valued worldwide for its high-quality hardwood.
Feature & Details
Scientific name: Tectona grandis
Common name: Teak
Family: Lamiaceae
Native range: India, Myanmar, Thailand, Laos, Indonesia
Tree size: Can grow up to 30–40 m tall
Wood type: Hardwood
Ecological Role of Tectona grandis
1. Habitat Provision
Mature teak trees provide habitat and shelter for a variety of wildlife, including birds, insects, and small mammals.
The tree’s large canopy offers shade, nesting sites, and food sources (flowers, seeds).
2. Soil Protection and Improvement
Teak trees help in preventing soil erosion, especially on slopes and degraded lands, by stabilizing the soil with their root systems.
Leaf litter contributes organic matter, enriching soil fertility over time.
However, teak plantations can sometimes lead to soil nutrient depletion if not managed sustainably.
3. Carbon Sequestration
As a fast-growing hardwood, teak stores significant amounts of carbon, playing a role in mitigating climate change by absorbing CO₂.
4. Influence on Microclimate
The dense canopy influences local microclimate by moderating temperature and humidity under the tree.
This creates a favourable environment for understory plants and animals.
5. Role in Forest Succession
In its native habitats, teak is part of mixed deciduous forests and contributes to forest succession dynamics.
It can colonize open or disturbed areas and facilitate the establishment of other species.
6. Biodiversity Considerations
Natural teak forests support high biodiversity with a rich assemblage of flora and fauna.
However, monoculture teak plantations tend to support fewer species, reducing biodiversity compared to native forests.
