Q&A: Triton's cost and the missing programme total

How much did Triton cost to build?

The initial estimate was $78 million and was exceeded. The final total remains uncertain because the available figures may omit wider programme expenditure.

Triton's initial estimated cost was $78 million, and she exceeded it substantially. By 1957, while construction was still under way and before launch, the cost growth had prompted reconsideration of how many radar-picket submarines to build. The objection to quoted final figures concerns their scope: a ship or unit cost can be accurate while omitting expenditure charged elsewhere in the programme. A complete programme breakdown would be needed to settle that wider total, so the final cost remains unresolved here.