Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| No. in series | No. in season | Title | Vessel Type | Vessel Operator | Narrated by | Original air date |
| --- | --- | --- | --- | --- | --- | --- |
| 20.0 | 1.0 | "MV Beluga Bremen" | Cargo Ship | Beluga Shipping | Anthony Green | 2011.0 |
| 21.0 | 2.0 | " USNS Robert E. Peary " | Cargo Ship | US Navy | Anthony Green | 2011.0 |
| 22.0 | 3.0 | "DSV Skandi Arctic" | Diving Support Vessel | DOF Subsea | Barbara Budd | 2011.0 |
| 23.0 | 4.0 | " MS Stena Britannica " | ROPAX Ferry | Stena Line | Anthony Green | 2011.0 |
| 24.0 | 5.0 | " USCGC Bertholf " | National Security Cutter | US Coast Guard | Barbara Budd | 2011.0 |
Question:
Name the vessel type for dof subsea
Answer:
Diving Support Vessel